diff --git a/backend/crates/api/src/openapi.rs b/backend/crates/api/src/openapi.rs
index e936b5e..46972e3 100644
--- a/backend/crates/api/src/openapi.rs
+++ b/backend/crates/api/src/openapi.rs
@@ -28,7 +28,7 @@ impl Modify for BearerAuth {
         crate::jobs::list, crate::jobs::kinds, crate::jobs::get_one, crate::jobs::run,
         crate::system::inventory, crate::system::upgrade,
         crate::cluster::overview, crate::cluster::restart, crate::cluster::scale, crate::cluster::set_image,
-        crate::vulnerabilities::list, crate::vulnerabilities::summary, crate::vulnerabilities::targets, crate::vulnerabilities::set_status,
+        crate::vulnerabilities::list, crate::vulnerabilities::groups, crate::vulnerabilities::summary, crate::vulnerabilities::targets, crate::vulnerabilities::set_status,
         crate::settings::get_notifications, crate::settings::put_notifications,
         crate::backups::list_targets, crate::backups::get_target, crate::backups::create_target, crate::backups::update_target,
         crate::backups::delete_target, crate::backups::test_target, crate::backups::list_strategies, crate::backups::get_strategy,
diff --git a/backend/crates/api/src/vulnerabilities.rs b/backend/crates/api/src/vulnerabilities.rs
index 9fd7fd6..1b35969 100644
--- a/backend/crates/api/src/vulnerabilities.rs
+++ b/backend/crates/api/src/vulnerabilities.rs
@@ -3,7 +3,7 @@ use application::vuln_service::{Summary, TargetSummary};
 use axum::extract::{Path, Query, State};
 use axum::routing::{get, post};
 use axum::{Json, Router};
-use domain::vuln::{Finding, FindingFilter, FindingStatus, Severity, TargetKind};
+use domain::vuln::{Finding, FindingFilter, FindingGroup, FindingStatus, Severity, TargetKind};
 use domain::DomainError;
 use serde::{Deserialize, Serialize};
 use utoipa::ToSchema;
@@ -16,6 +16,7 @@ use crate::AppState;
 pub fn router() -> Router<AppState> {
     Router::new()
         .route("/", get(list))
+        .route("/groups", get(groups))
         .route("/summary", get(summary))
         .route("/targets", get(targets))
         .route("/{id}/status", post(set_status))
@@ -26,36 +27,55 @@ pub struct ListQuery {
     pub min_severity: Option<String>,
     /// `host` (OS, packages, applications) or `container` (images in the cluster).
     pub scope: Option<String>,
+    /// Restrict to one package; used to expand a host group.
+    pub package: Option<String>,
     pub target: Option<String>,
     pub status: Option<String>,
     #[serde(default)]
     pub include_fixed: bool,
 }
 
+impl ListQuery {
+    fn into_filter(self) -> Result<FindingFilter, DomainError> {
+        let target_kind = match self.scope.as_deref() {
+            None => None,
+            Some(s) => Some(TargetKind::parse_scope(s).ok_or_else(|| {
+                DomainError::Validation(format!(
+                    "unknown scope '{s}', expected 'host' or 'container'"
+                ))
+            })?),
+        };
+        Ok(FindingFilter {
+            min_severity: self.min_severity.as_deref().map(Severity::parse),
+            target_kind,
+            target: self.target,
+            package: self.package,
+            status: self.status.as_deref().and_then(FindingStatus::parse),
+            include_fixed: self.include_fixed,
+        })
+    }
+}
+
 #[utoipa::path(get, path = "/api/vulnerabilities", tag = "vulnerabilities", security(("bearer" = [])),
-    params(("min_severity" = Option<String>, Query), ("scope" = Option<String>, Query), ("target" = Option<String>, Query), ("status" = Option<String>, Query), ("include_fixed" = Option<bool>, Query)),
+    params(("min_severity" = Option<String>, Query), ("scope" = Option<String>, Query), ("package" = Option<String>, Query), ("target" = Option<String>, Query), ("status" = Option<String>, Query), ("include_fixed" = Option<bool>, Query)),
     responses((status = 200, body = Vec<Object>)))]
 async fn list(
     State(state): State<AppState>,
     _: AuthUser,
     Query(q): Query<ListQuery>,
 ) -> Result<Json<Vec<Finding>>, ApiError> {
-    let target_kind = match q.scope.as_deref() {
-        None => None,
-        Some(s) => Some(TargetKind::parse_scope(s).ok_or_else(|| {
-            DomainError::Validation(format!(
-                "unknown scope '{s}', expected 'host' or 'container'"
-            ))
-        })?),
-    };
-    let filter = FindingFilter {
-        min_severity: q.min_severity.as_deref().map(Severity::parse),
-        target_kind,
-        target: q.target,
-        status: q.status.as_deref().and_then(FindingStatus::parse),
-        include_fixed: q.include_fixed,
-    };
-    Ok(Json(state.vulns.list(filter).await?))
+    Ok(Json(state.vulns.list(q.into_filter()?).await?))
+}
+
+#[utoipa::path(get, path = "/api/vulnerabilities/groups", tag = "vulnerabilities", security(("bearer" = [])),
+    params(("scope" = Option<String>, Query), ("min_severity" = Option<String>, Query), ("target" = Option<String>, Query), ("status" = Option<String>, Query)),
+    responses((status = 200, body = Vec<Object>), (status = 422)))]
+async fn groups(
+    State(state): State<AppState>,
+    _: AuthUser,
+    Query(q): Query<ListQuery>,
+) -> Result<Json<Vec<FindingGroup>>, ApiError> {
+    Ok(Json(state.vulns.groups(q.into_filter()?).await?))
 }
 
 #[derive(Serialize, ToSchema)]
diff --git a/backend/crates/api/tests/vulnerabilities.rs b/backend/crates/api/tests/vulnerabilities.rs
index b8f262e..ce78f8d 100644
--- a/backend/crates/api/tests/vulnerabilities.rs
+++ b/backend/crates/api/tests/vulnerabilities.rs
@@ -257,3 +257,76 @@ async fn targets_carry_their_scope_and_open_count() {
     assert_eq!(image["kind"], "image");
     assert!(image["open"].as_u64().unwrap() >= 1);
 }
+
+#[tokio::test]
+async fn findings_are_rolled_up_per_package_and_image() {
+    let app = test_app_with_admin().await;
+    let token = common::login(&app, ADMIN, PW).await.access;
+    run_scan(&app, &token).await;
+
+    let host = get(
+        &app,
+        "/api/vulnerabilities/groups?scope=host&min_severity=unknown",
+        Some(&token),
+    )
+    .await;
+    assert_eq!(host.status, StatusCode::OK, "{}", host.json);
+    let groups = host.json.as_array().unwrap();
+    let flat = get(
+        &app,
+        "/api/vulnerabilities?scope=host&min_severity=unknown",
+        Some(&token),
+    )
+    .await;
+    let flat_len = flat.json.as_array().unwrap().len();
+    assert!(groups.len() < flat_len, "fewer rows than findings");
+    assert_eq!(
+        groups
+            .iter()
+            .map(|g| g["total"].as_u64().unwrap())
+            .sum::<u64>() as usize,
+        flat_len
+    );
+    let zlib = groups.iter().find(|g| g["key"] == "zlib1g").unwrap();
+    assert_eq!(zlib["kind"], "os");
+    assert_eq!(zlib["source"], "debian");
+    assert_eq!(zlib["counts"]["critical"], 1);
+    assert!(zlib["installed"].as_str().unwrap().starts_with("1:1.2.13"));
+
+    let images = get(
+        &app,
+        "/api/vulnerabilities/groups?scope=container&min_severity=unknown",
+        Some(&token),
+    )
+    .await;
+    let images = images.json.as_array().unwrap();
+    let gitea = images
+        .iter()
+        .find(|g| g["key"].as_str().unwrap().contains("gitea"))
+        .unwrap();
+    assert_eq!(gitea["kind"], "image");
+    assert!(gitea["total"].as_u64().unwrap() >= 1);
+    assert!(gitea["packages"].as_u64().unwrap() >= 1);
+
+    // a group is expanded by filtering the flat list
+    let pkg = get(
+        &app,
+        "/api/vulnerabilities?scope=host&package=zlib1g&min_severity=unknown",
+        Some(&token),
+    )
+    .await;
+    let pkg = pkg.json.as_array().unwrap();
+    assert_eq!(pkg.len(), zlib["total"].as_u64().unwrap() as usize);
+    assert!(pkg.iter().all(|f| f["package"] == "zlib1g"));
+
+    assert_eq!(
+        get(&app, "/api/vulnerabilities/groups?scope=nope", Some(&token))
+            .await
+            .status,
+        StatusCode::UNPROCESSABLE_ENTITY
+    );
+    assert_eq!(
+        get(&app, "/api/vulnerabilities/groups", None).await.status,
+        StatusCode::UNAUTHORIZED
+    );
+}
diff --git a/backend/crates/application/src/test_fakes.rs b/backend/crates/application/src/test_fakes.rs
index 8bb58c7..a661da2 100644
--- a/backend/crates/application/src/test_fakes.rs
+++ b/backend/crates/application/src/test_fakes.rs
@@ -507,7 +507,8 @@ impl ClusterGateway for MemCluster {
 
 use domain::ports::{FindingRepository, VulnerabilityScanner};
 use domain::vuln::{
-    Finding, FindingFilter, FindingStatus, RawFinding, Severity, SeverityCounts, TargetKind,
+    Finding, FindingFilter, FindingGroup, FindingStatus, RawFinding, Severity, SeverityCounts,
+    TargetKind,
 };
 
 pub fn raw(
@@ -630,6 +631,7 @@ impl FindingRepository for MemFindings {
             .filter(|f| filter.include_fixed || f.status != FindingStatus::Fixed)
             .filter(|f| filter.min_severity.is_none_or(|m| f.raw.severity >= m))
             .filter(|f| filter.target_kind.is_none_or(|k| f.target_kind == k))
+            .filter(|f| filter.package.as_ref().is_none_or(|p| &f.raw.package == p))
             .filter(|f| filter.target.as_ref().is_none_or(|t| &f.target == t))
             .filter(|f| filter.status.is_none_or(|s| f.status == s))
             .cloned()
@@ -642,6 +644,71 @@ impl FindingRepository for MemFindings {
         });
         Ok(v)
     }
+    async fn groups(&self, filter: &FindingFilter) -> Result<Vec<FindingGroup>, DomainError> {
+        let per_image = filter.target_kind == Some(TargetKind::Image);
+        let mut by_key: HashMap<String, FindingGroup> = HashMap::new();
+        let mut packages: HashMap<String, std::collections::HashSet<String>> = HashMap::new();
+        for f in self.list(filter).await? {
+            let key = if per_image {
+                f.target.clone()
+            } else {
+                f.raw.package.clone()
+            };
+            packages
+                .entry(key.clone())
+                .or_default()
+                .insert(f.raw.package.clone());
+            let g = by_key.entry(key.clone()).or_insert_with(|| FindingGroup {
+                key,
+                kind: f.target_kind,
+                source: if per_image {
+                    String::new()
+                } else {
+                    f.raw.source.clone()
+                },
+                installed: if per_image {
+                    String::new()
+                } else {
+                    f.raw.installed_version.clone()
+                },
+                counts: SeverityCounts::default(),
+                total: 0,
+                fixable: 0,
+                packages: 0,
+            });
+            g.counts.add(f.raw.severity);
+            g.total += 1;
+            if f.raw.fixed_version.is_some() {
+                g.fixable += 1;
+            }
+        }
+        let mut groups: Vec<FindingGroup> = by_key
+            .into_values()
+            .map(|mut g| {
+                g.packages = packages.get(&g.key).map(|p| p.len()).unwrap_or(1);
+                g
+            })
+            .collect();
+        let worst = |g: &FindingGroup| {
+            Severity::ALL
+                .iter()
+                .position(|s| match s {
+                    Severity::Critical => g.counts.critical > 0,
+                    Severity::High => g.counts.high > 0,
+                    Severity::Medium => g.counts.medium > 0,
+                    Severity::Low => g.counts.low > 0,
+                    Severity::Unknown => g.counts.unknown > 0,
+                })
+                .unwrap_or(usize::MAX)
+        };
+        groups.sort_by(|a, b| {
+            worst(a)
+                .cmp(&worst(b))
+                .then(b.total.cmp(&a.total))
+                .then(a.key.cmp(&b.key))
+        });
+        Ok(groups)
+    }
     async fn counts(&self, kind: Option<TargetKind>) -> Result<SeverityCounts, DomainError> {
         let mut c = SeverityCounts::default();
         for f in
diff --git a/backend/crates/application/src/tests/vuln_tests.rs b/backend/crates/application/src/tests/vuln_tests.rs
index 0ad87dc..d6ca817 100644
--- a/backend/crates/application/src/tests/vuln_tests.rs
+++ b/backend/crates/application/src/tests/vuln_tests.rs
@@ -417,17 +417,38 @@ async fn host_findings_are_grouped_per_package_and_containers_per_image() {
         .with(
             "os",
             Ok(vec![
-                raw("CVE-1", "openssl", "3.0.1", Severity::Critical, Some("3.0.2")),
+                raw(
+                    "CVE-1",
+                    "openssl",
+                    "3.0.1",
+                    Severity::Critical,
+                    Some("3.0.2"),
+                ),
                 raw("CVE-2", "openssl", "3.0.1", Severity::Low, None),
                 go,
             ]),
         )
-        .with(GITEA, Ok(vec![raw("CVE-3", "git", "2.39", Severity::High, None), raw("CVE-4", "curl", "7.8", Severity::Medium, None)]))
-        .with(PG, Ok(vec![raw("CVE-5", "libssl3", "3.0", Severity::Low, None)]));
+        .with(
+            GITEA,
+            Ok(vec![
+                raw("CVE-3", "git", "2.39", Severity::High, None),
+                raw("CVE-4", "curl", "7.8", Severity::Medium, None),
+            ]),
+        )
+        .with(
+            PG,
+            Ok(vec![raw("CVE-5", "libssl3", "3.0", Severity::Low, None)]),
+        );
     let (_f, svc) = fixture(scanner);
     svc.scan(&VecLog::default()).await.unwrap();
 
-    let host = svc.groups(FindingFilter { target_kind: Some(TargetKind::Os), ..Default::default() }).await.unwrap();
+    let host = svc
+        .groups(FindingFilter {
+            target_kind: Some(TargetKind::Os),
+            ..Default::default()
+        })
+        .await
+        .unwrap();
     assert_eq!(host.len(), 2, "one row per package, not per CVE");
     // worst severity first
     assert_eq!(host[0].key, "openssl");
@@ -440,30 +461,75 @@ async fn host_findings_are_grouped_per_package_and_containers_per_image() {
     assert_eq!(host[1].key, "stdlib");
     assert_eq!(host[1].source, "gobinary");
 
-    let images = svc.groups(FindingFilter { target_kind: Some(TargetKind::Image), ..Default::default() }).await.unwrap();
-    assert_eq!(images.iter().map(|g| g.key.as_str()).collect::<Vec<_>>(), vec![GITEA, PG]);
+    let images = svc
+        .groups(FindingFilter {
+            target_kind: Some(TargetKind::Image),
+            ..Default::default()
+        })
+        .await
+        .unwrap();
+    assert_eq!(
+        images.iter().map(|g| g.key.as_str()).collect::<Vec<_>>(),
+        vec![GITEA, PG]
+    );
     assert_eq!(images[0].total, 2);
     assert_eq!(images[0].packages, 2, "distinct packages in the image");
 
     // the group list honours the other filters
     let high = svc
-        .groups(FindingFilter { target_kind: Some(TargetKind::Os), min_severity: Some(Severity::High), ..Default::default() })
+        .groups(FindingFilter {
+            target_kind: Some(TargetKind::Os),
+            min_severity: Some(Severity::High),
+            ..Default::default()
+        })
         .await
         .unwrap();
-    assert_eq!(high.iter().map(|g| g.key.as_str()).collect::<Vec<_>>(), vec!["openssl", "stdlib"]);
-    assert_eq!(high[0].total, 1, "the low finding is filtered out of the counts");
+    assert_eq!(
+        high.iter().map(|g| g.key.as_str()).collect::<Vec<_>>(),
+        vec!["openssl", "stdlib"]
+    );
+    assert_eq!(
+        high[0].total, 1,
+        "the low finding is filtered out of the counts"
+    );
 }
 
 #[tokio::test]
 async fn findings_of_one_group_can_be_listed() {
     let scanner = FakeScanner::default()
-        .with("os", Ok(vec![raw("CVE-1", "openssl", "3.0.1", Severity::Critical, None), raw("CVE-2", "bash", "5.2", Severity::Low, None)]))
-        .with(GITEA, Ok(vec![raw("CVE-3", "git", "2.39", Severity::High, None)]));
+        .with(
+            "os",
+            Ok(vec![
+                raw("CVE-1", "openssl", "3.0.1", Severity::Critical, None),
+                raw("CVE-2", "bash", "5.2", Severity::Low, None),
+            ]),
+        )
+        .with(
+            GITEA,
+            Ok(vec![raw("CVE-3", "git", "2.39", Severity::High, None)]),
+        );
     let (_f, svc) = fixture(scanner);
     svc.scan(&VecLog::default()).await.unwrap();
 
-    let pkg = svc.list(FindingFilter { package: Some("openssl".into()), ..Default::default() }).await.unwrap();
-    assert_eq!(pkg.iter().map(|f| f.raw.cve_id.as_str()).collect::<Vec<_>>(), vec!["CVE-1"]);
-    let image = svc.list(FindingFilter { target: Some(GITEA.into()), ..Default::default() }).await.unwrap();
+    let pkg = svc
+        .list(FindingFilter {
+            package: Some("openssl".into()),
+            ..Default::default()
+        })
+        .await
+        .unwrap();
+    assert_eq!(
+        pkg.iter()
+            .map(|f| f.raw.cve_id.as_str())
+            .collect::<Vec<_>>(),
+        vec!["CVE-1"]
+    );
+    let image = svc
+        .list(FindingFilter {
+            target: Some(GITEA.into()),
+            ..Default::default()
+        })
+        .await
+        .unwrap();
     assert_eq!(image.len(), 1);
 }
diff --git a/backend/crates/application/src/vuln_service.rs b/backend/crates/application/src/vuln_service.rs
index 97bf1ac..9e76cea 100644
--- a/backend/crates/application/src/vuln_service.rs
+++ b/backend/crates/application/src/vuln_service.rs
@@ -7,8 +7,8 @@ use async_trait::async_trait;
 use chrono::{DateTime, Utc};
 use domain::ports::{ClusterGateway, FindingRepository, LineSink, VulnerabilityScanner};
 use domain::vuln::{
-    Finding, FindingFilter, FindingStatus, RawFinding, ScanReport, Severity, SeverityCounts,
-    TargetKind,
+    Finding, FindingFilter, FindingGroup, FindingStatus, RawFinding, ScanReport, Severity,
+    SeverityCounts, TargetKind,
 };
 use domain::DomainError;
 use uuid::Uuid;
@@ -237,6 +237,11 @@ impl VulnerabilityService {
         self.findings.list(&filter).await
     }
 
+    /// Findings rolled up per package (host) or per image (containers).
+    pub async fn groups(&self, filter: FindingFilter) -> Result<Vec<FindingGroup>, DomainError> {
+        self.findings.groups(&filter).await
+    }
+
     /// Scanned targets that still have open findings, host first.
     pub async fn targets(&self) -> Result<Vec<TargetSummary>, DomainError> {
         let mut by_target: std::collections::HashMap<(TargetKind, String), usize> =
diff --git a/backend/crates/infrastructure/src/sqlite.rs b/backend/crates/infrastructure/src/sqlite.rs
index 1557da4..ddfa138 100644
--- a/backend/crates/infrastructure/src/sqlite.rs
+++ b/backend/crates/infrastructure/src/sqlite.rs
@@ -496,7 +496,8 @@ impl domain::ports::InventoryRepository for SqliteInventory {
 }
 
 use domain::vuln::{
-    Finding, FindingFilter, FindingStatus, RawFinding, Severity, SeverityCounts, TargetKind,
+    Finding, FindingFilter, FindingGroup, FindingStatus, RawFinding, Severity, SeverityCounts,
+    TargetKind,
 };
 
 pub struct SqliteFindings(pub DbPool);
@@ -629,6 +630,9 @@ impl domain::ports::FindingRepository for SqliteFindings {
         if filter.target_kind.is_some() {
             sql.push_str(" AND target_kind = ?");
         }
+        if filter.package.is_some() {
+            sql.push_str(" AND package = ?");
+        }
         if filter.min_severity.is_some() {
             sql.push_str(&format!(" AND {SEVERITY_RANK_SQL} >= ?"));
         }
@@ -645,6 +649,9 @@ impl domain::ports::FindingRepository for SqliteFindings {
         if let Some(k) = filter.target_kind {
             q = q.bind(k.as_str());
         }
+        if let Some(p) = &filter.package {
+            q = q.bind(p);
+        }
         if let Some(m) = filter.min_severity {
             q = q.bind(severity_rank(m));
         }
@@ -653,6 +660,94 @@ impl domain::ports::FindingRepository for SqliteFindings {
             .map(|rows| rows.iter().map(finding_from_row).collect())
             .map_err(storage)
     }
+    async fn groups(&self, filter: &FindingFilter) -> Result<Vec<FindingGroup>, DomainError> {
+        // Host findings roll up per package, container findings per image.
+        let per_image = filter.target_kind == Some(TargetKind::Image);
+        let key = if per_image { "target" } else { "package" };
+        let mut sql = format!(
+            "SELECT {key} AS key, target_kind, \
+             COALESCE(MAX(source), '') AS source, COALESCE(MAX(installed_version), '') AS installed, \
+             COUNT(*) AS total, \
+             SUM(fixed_version IS NOT NULL AND fixed_version != '') AS fixable, \
+             COUNT(DISTINCT package) AS packages, \
+             SUM(severity = 'critical') AS critical, SUM(severity = 'high') AS high, \
+             SUM(severity = 'medium') AS medium, SUM(severity = 'low') AS low, \
+             SUM(severity NOT IN ('critical', 'high', 'medium', 'low')) AS unknown \
+             FROM findings WHERE 1=1"
+        );
+        if !filter.include_fixed {
+            sql.push_str(" AND status != 'fixed'");
+        }
+        if filter.status.is_some() {
+            sql.push_str(" AND status = ?");
+        }
+        if filter.target.is_some() {
+            sql.push_str(" AND target = ?");
+        }
+        if filter.target_kind.is_some() {
+            sql.push_str(" AND target_kind = ?");
+        }
+        if filter.package.is_some() {
+            sql.push_str(" AND package = ?");
+        }
+        if filter.min_severity.is_some() {
+            sql.push_str(&format!(" AND {SEVERITY_RANK_SQL} >= ?"));
+        }
+        // worst severity first, then most findings, then by name
+        sql.push_str(&format!(
+            " GROUP BY {key}, target_kind ORDER BY MAX({SEVERITY_RANK_SQL}) DESC, total DESC, key"
+        ));
+        let mut q = sqlx::query(&sql);
+        if let Some(st) = filter.status {
+            q = q.bind(st.as_str());
+        }
+        if let Some(t) = &filter.target {
+            q = q.bind(t);
+        }
+        if let Some(k) = filter.target_kind {
+            q = q.bind(k.as_str());
+        }
+        if let Some(p) = &filter.package {
+            q = q.bind(p);
+        }
+        if let Some(m) = filter.min_severity {
+            q = q.bind(severity_rank(m));
+        }
+        let rows = q.fetch_all(&self.0).await.map_err(storage)?;
+        Ok(rows
+            .iter()
+            .map(|r| {
+                let n = |c: &str| r.get::<i64, _>(c) as usize;
+                let kind = TargetKind::parse(r.get::<String, _>("target_kind").as_str())
+                    .unwrap_or(TargetKind::Os);
+                FindingGroup {
+                    key: r.get("key"),
+                    kind,
+                    source: if kind == TargetKind::Image {
+                        String::new()
+                    } else {
+                        r.get("source")
+                    },
+                    installed: if kind == TargetKind::Image {
+                        String::new()
+                    } else {
+                        r.get("installed")
+                    },
+                    counts: SeverityCounts {
+                        critical: n("critical"),
+                        high: n("high"),
+                        medium: n("medium"),
+                        low: n("low"),
+                        unknown: n("unknown"),
+                    },
+                    total: n("total"),
+                    fixable: n("fixable"),
+                    packages: n("packages"),
+                }
+            })
+            .collect())
+    }
+
     async fn counts(&self, kind: Option<TargetKind>) -> Result<SeverityCounts, DomainError> {
         let sql = match kind {
             Some(_) => "SELECT severity, COUNT(*) FROM findings WHERE status != 'fixed' AND target_kind = ? GROUP BY severity",
@@ -807,6 +902,77 @@ mod finding_tests {
             "source survives the roundtrip"
         );
     }
+
+    #[tokio::test]
+    async fn groups_roll_up_per_package_and_per_image() {
+        let pool = crate::connect("sqlite::memory:").await.unwrap();
+        let repo = SqliteFindings(pool);
+        let mut a = finding("os", TargetKind::Os, "CVE-A", Severity::Critical);
+        a.raw.package = "openssl".into();
+        a.raw.fixed_version = Some("3.0.2".into());
+        let mut b = finding("os", TargetKind::Os, "CVE-B", Severity::Low);
+        b.raw.package = "openssl".into();
+        let mut c = finding("os", TargetKind::Os, "CVE-C", Severity::High);
+        c.raw.package = "stdlib".into();
+        c.raw.source = "gobinary".into();
+        let mut d = finding("img:1", TargetKind::Image, "CVE-D", Severity::Medium);
+        d.raw.package = "curl".into();
+        let mut e = finding("img:1", TargetKind::Image, "CVE-E", Severity::High);
+        e.raw.package = "git".into();
+        for f in [&a, &b, &c, &d, &e] {
+            repo.insert(f).await.unwrap();
+        }
+
+        let host = repo
+            .groups(&FindingFilter {
+                target_kind: Some(TargetKind::Os),
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_eq!(
+            host.iter().map(|g| g.key.as_str()).collect::<Vec<_>>(),
+            vec!["openssl", "stdlib"]
+        );
+        assert_eq!(host[0].counts.critical, 1);
+        assert_eq!(host[0].counts.low, 1);
+        assert_eq!(host[0].total, 2);
+        assert_eq!(host[0].fixable, 1);
+        assert_eq!(host[0].installed, "1");
+        assert_eq!(host[1].source, "gobinary");
+
+        let images = repo
+            .groups(&FindingFilter {
+                target_kind: Some(TargetKind::Image),
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_eq!(images.len(), 1);
+        assert_eq!(images[0].key, "img:1");
+        assert_eq!(images[0].total, 2);
+        assert_eq!(images[0].packages, 2);
+
+        // fixed findings stay out unless asked for, and the package filter drills in
+        repo.set_status(b.id, FindingStatus::Fixed).await.unwrap();
+        let host = repo
+            .groups(&FindingFilter {
+                target_kind: Some(TargetKind::Os),
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_eq!(host[0].total, 1);
+        let drilled = repo
+            .list(&FindingFilter {
+                package: Some("stdlib".into()),
+                ..Default::default()
+            })
+            .await
+            .unwrap();
+        assert_eq!(drilled.len(), 1);
+        assert_eq!(drilled[0].raw.cve_id, "CVE-C");
+    }
 }
 
 use domain::backup::{BackupRecord, BackupSource, BackupStrategy, BackupTarget, StorageKind};
diff --git a/backend/crates/infrastructure/src/trivy.rs b/backend/crates/infrastructure/src/trivy.rs
index 8ce98b0..9816ec0 100644
--- a/backend/crates/infrastructure/src/trivy.rs
+++ b/backend/crates/infrastructure/src/trivy.rs
@@ -202,6 +202,17 @@ impl VulnerabilityScanner for FakeScanner {
                 url: "https://avd.aquasec.com/nvd/cve-2024-5535".into(),
                 source: "debian".into(),
             },
+            // a second flaw in the same package: the grouped view collapses both into one row
+            RawFinding {
+                cve_id: "CVE-2024-2511".into(),
+                severity: Severity::Medium,
+                package: "openssl".into(),
+                installed_version: "3.0.15-1~deb12u1".into(),
+                fixed_version: Some("3.0.16-1~deb12u1".into()),
+                title: "openssl: unbounded memory growth in the session cache".into(),
+                url: "https://avd.aquasec.com/nvd/cve-2024-2511".into(),
+                source: "debian".into(),
+            },
             RawFinding {
                 cve_id: "CVE-2023-45853".into(),
                 severity: Severity::Critical,
diff --git a/frontend/e2e/vuln-groups.spec.ts b/frontend/e2e/vuln-groups.spec.ts
index dd2021e..70608a3 100644
--- a/frontend/e2e/vuln-groups.spec.ts
+++ b/frontend/e2e/vuln-groups.spec.ts
@@ -15,7 +15,7 @@ test('packages and images are one row each and expand to their CVEs', async ({ p
   await scan(page)
 
   // host: a row per package, no CVE ids until a row is opened
-  const zlib = page.getByRole('row', { name: /^zlib1g/ })
+  const zlib = page.getByRole('row', { name: /zlib1g/ })
   await expect(zlib).toBeVisible()
   await expect(page.getByRole('row', { name: /CVE-2023-45853/ })).toHaveCount(0)
 
diff --git a/frontend/e2e/vuln-scopes.spec.ts b/frontend/e2e/vuln-scopes.spec.ts
index 817638a..e0b9dda 100644
--- a/frontend/e2e/vuln-scopes.spec.ts
+++ b/frontend/e2e/vuln-scopes.spec.ts
@@ -19,19 +19,18 @@ test('host and container findings are separated into two categories', async ({ p
   await expect(page.getByTestId('scope-container')).toContainText('images')
   await expect(page.getByTestId('scope-container-critical')).not.toHaveText('0')
 
-  // host is selected first and shows only host findings, with the package source
+  // host is selected first and lists host packages with their source
   await expect(page.getByTestId('scope-host')).toHaveAttribute('aria-pressed', 'true')
-  await expect(page.getByRole('row', { name: /CVE-2023-45853/ })).toBeVisible()
-  await expect(page.getByRole('row', { name: /CVE-2024-24790/ })).toHaveCount(0)
+  await expect(page.getByRole('row', { name: /zlib1g/ })).toBeVisible()
+  await expect(page.getByRole('row', { name: /gitea\/gitea/ })).toHaveCount(0)
   await expect(page.getByTestId('findings-scroll')).toContainText('Source')
 
   // switching to containers swaps the table
   await page.getByTestId('scope-container').click()
   await expect(page.getByTestId('scope-container')).toHaveAttribute('aria-pressed', 'true')
-  await expect(page.getByRole('row', { name: /CVE-2024-24790/ })).toBeVisible()
-  await expect(page.getByRole('row', { name: /CVE-2023-45853/ })).toHaveCount(0)
-  await expect(page.getByTestId('findings-scroll')).toContainText('Image')
   await expect(page.getByRole('row', { name: /gitea\/gitea/ }).first()).toBeVisible()
+  await expect(page.getByRole('row', { name: /zlib1g/ })).toHaveCount(0)
+  await expect(page.getByTestId('findings-scroll')).toContainText('Image')
 
   // the filter is labelled per category and only offers targets of that category
   const images = await page.getByLabel('Image', { exact: true }).locator('option').allTextContents()
diff --git a/frontend/e2e/vulnerabilities.spec.ts b/frontend/e2e/vulnerabilities.spec.ts
index 312f557..efa38c4 100644
--- a/frontend/e2e/vulnerabilities.spec.ts
+++ b/frontend/e2e/vulnerabilities.spec.ts
@@ -9,13 +9,15 @@ test('admin runs a scan, filters findings and acknowledges one', async ({ page }
 
   await page.getByRole('button', { name: 'Scan now' }).click()
   await expect(page.getByTestId('scope-host-critical')).not.toHaveText('0', { timeout: 20_000 })
+  await page.getByRole('row', { name: /zlib1g/ }).click()
   await expect(page.getByRole('row', { name: /CVE-2023-45853/ })).toBeVisible()
 
   await page.getByLabel('Minimum severity').selectOption('critical')
-  await expect(page.getByRole('row', { name: /CVE-2011-3374/ })).toHaveCount(0)
+  await expect(page.getByRole('row', { name: /apt/ })).toHaveCount(0)
   await page.getByLabel('Minimum severity').selectOption('low')
-  await expect(page.getByRole('row', { name: /CVE-2011-3374/ })).toBeVisible()
+  await expect(page.getByRole('row', { name: /apt/ })).toBeVisible()
 
+  await page.getByRole('row', { name: /zlib1g/ }).click()
   const row = page.getByRole('row', { name: /CVE-2023-45853/ })
   await row.getByRole('button', { name: 'Acknowledge' }).click()
   await expect(row).toContainText('acknowledged')
diff --git a/frontend/src/components/FindingGroups.vue b/frontend/src/components/FindingGroups.vue
new file mode 100644
index 0000000..9705a1d
--- /dev/null
+++ b/frontend/src/components/FindingGroups.vue
@@ -0,0 +1,135 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import type { Finding, FindingGroup, FindingScope, SeverityCounts } from '../api/types'
+import FindingTable from './FindingTable.vue'
+
+const props = defineProps<{
+  groups: FindingGroup[]
+  scope: FindingScope
+  canAct: boolean
+  /** Loads the findings of one group; called once per group and cached. */
+  load: (group: FindingGroup) => Promise<Finding[]>
+}>()
+const emit = defineEmits<{
+  status: [f: Finding, status: 'open' | 'acknowledged']
+  select: [f: Finding]
+}>()
+
+const open = ref<Set<string>>(new Set())
+const loaded = ref<Record<string, Finding[]>>({})
+const loading = ref<Set<string>>(new Set())
+
+async function toggle(g: FindingGroup) {
+  if (open.value.has(g.key)) {
+    open.value.delete(g.key)
+    return
+  }
+  open.value.add(g.key)
+  if (loaded.value[g.key]) return
+  loading.value.add(g.key)
+  try {
+    loaded.value[g.key] = await props.load(g)
+  } finally {
+    loading.value.delete(g.key)
+  }
+}
+
+/** Drop cached findings so the next expansion reloads them. */
+function reset() {
+  loaded.value = {}
+  open.value.clear()
+}
+defineExpose({ reset })
+
+const chips = [
+  { key: 'critical' as const, cls: 'bg-red-600 text-white' },
+  { key: 'high' as const, cls: 'bg-orange-500 text-white' },
+  { key: 'medium' as const, cls: 'bg-amber-300 text-amber-900' },
+  { key: 'low' as const, cls: 'bg-gray-200 text-gray-700' },
+  { key: 'unknown' as const, cls: 'bg-gray-100 text-gray-500' },
+]
+const shown = (c: SeverityCounts) => chips.filter((s) => c[s.key] > 0)
+</script>
+
+<template>
+  <div data-testid="findings-scroll" class="overflow-x-auto">
+    <table class="w-full text-left text-sm">
+      <thead class="border-b border-gray-200 text-gray-500">
+        <tr>
+          <th class="w-6"></th>
+          <th class="py-2">{{ scope === 'host' ? 'Package' : 'Image' }}</th>
+          <th>{{ scope === 'host' ? 'Source' : 'Packages' }}</th>
+          <th>{{ scope === 'host' ? 'Installed' : '' }}</th>
+          <th>Findings</th>
+          <th>Severity</th>
+        </tr>
+      </thead>
+      <tbody>
+        <template v-for="g in groups" :key="g.key">
+          <tr
+            class="cursor-pointer border-b border-gray-100 hover:bg-gray-50"
+            :class="open.has(g.key) ? 'bg-gray-50' : ''"
+            :aria-expanded="open.has(g.key)"
+            @click="toggle(g)"
+          >
+            <td class="py-2 text-gray-400">{{ open.has(g.key) ? '▾' : '▸' }}</td>
+            <td class="max-w-[24rem] truncate font-mono font-medium" :title="g.key">{{ g.key }}</td>
+            <td class="text-xs text-gray-600">
+              <span v-if="scope === 'host'" class="rounded bg-gray-100 px-1.5 py-0.5 font-mono">{{
+                g.source || 'unknown'
+              }}</span>
+              <span v-else>{{ g.packages }} packages</span>
+            </td>
+            <td class="max-w-[12rem] truncate font-mono text-xs text-gray-600" :title="g.installed">
+              {{ g.installed }}
+            </td>
+            <td class="whitespace-nowrap">
+              {{ g.total }}
+              <span v-if="g.fixable" class="ml-1 text-xs text-green-700"
+                >{{ g.fixable }} fixable</span
+              >
+            </td>
+            <td>
+              <span class="flex flex-wrap gap-1">
+                <span
+                  v-for="s in shown(g.counts)"
+                  :key="s.key"
+                  class="rounded-full px-1.5 py-0.5 text-xs font-medium"
+                  :class="s.cls"
+                  :title="s.key"
+                >
+                  {{ g.counts[s.key] }}
+                </span>
+              </span>
+            </td>
+          </tr>
+          <!-- layout row: the nested table carries the semantics -->
+          <tr v-if="open.has(g.key)" :key="`${g.key}-detail`" role="presentation">
+            <td
+              role="presentation"
+              colspan="6"
+              class="border-b border-gray-100 bg-gray-50 px-6 py-3"
+            >
+              <p v-if="loading.has(g.key)" class="text-sm text-gray-500">Loading findings…</p>
+              <p v-else-if="!loaded[g.key]?.length" class="text-sm text-gray-500">
+                No findings in this group.
+              </p>
+              <FindingTable
+                v-else
+                :findings="loaded[g.key]"
+                :scope="scope"
+                :can-act="canAct"
+                context="group"
+                @status="(f, s) => emit('status', f, s)"
+                @select="(f) => emit('select', f)"
+              />
+            </td>
+          </tr>
+        </template>
+        <tr v-if="groups.length === 0">
+          <td colspan="6" class="py-6 text-center text-gray-500">No findings.</td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+</template>
diff --git a/frontend/src/components/FindingTable.vue b/frontend/src/components/FindingTable.vue
index b750656..1ee68f4 100644
--- a/frontend/src/components/FindingTable.vue
+++ b/frontend/src/components/FindingTable.vue
@@ -1,7 +1,15 @@
 <script setup lang="ts">
 import type { Finding, FindingScope } from '../api/types'
 
-defineProps<{ findings: Finding[]; canAct: boolean; scope: FindingScope }>()
+const props = defineProps<{
+  findings: Finding[]
+  canAct: boolean
+  scope: FindingScope
+  /** 'group' hides the column that the surrounding group row already names. */
+  context?: 'flat' | 'group'
+}>()
+
+const inGroup = () => props.context === 'group'
 defineEmits<{ status: [f: Finding, status: 'open' | 'acknowledged']; select: [f: Finding] }>()
 
 const sev: Record<string, string> = {
@@ -20,10 +28,10 @@ const sev: Record<string, string> = {
         <tr>
           <th class="py-2">Severity</th>
           <th>CVE</th>
-          <th>Package</th>
+          <th v-if="!(inGroup() && scope === 'host')">Package</th>
           <th>Installed</th>
           <th>Fixed in</th>
-          <th>{{ scope === 'host' ? 'Source' : 'Image' }}</th>
+          <th v-if="!inGroup()">{{ scope === 'host' ? 'Source' : 'Image' }}</th>
           <th>Status</th>
           <th></th>
         </tr>
@@ -41,7 +49,13 @@ const sev: Record<string, string> = {
             }}</span>
           </td>
           <td class="whitespace-nowrap font-mono">{{ f.cve_id }}</td>
-          <td class="max-w-[14rem] truncate font-mono" :title="f.package">{{ f.package }}</td>
+          <td
+            v-if="!(inGroup() && scope === 'host')"
+            class="max-w-[14rem] truncate font-mono"
+            :title="f.package"
+          >
+            {{ f.package }}
+          </td>
           <td class="max-w-[12rem] truncate font-mono text-xs" :title="f.installed_version">
             {{ f.installed_version }}
           </td>
diff --git a/frontend/src/pages/VulnerabilitiesPage.vue b/frontend/src/pages/VulnerabilitiesPage.vue
index 60d96b8..7a25f01 100644
--- a/frontend/src/pages/VulnerabilitiesPage.vue
+++ b/frontend/src/pages/VulnerabilitiesPage.vue
@@ -3,6 +3,7 @@ import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
 import { api, ApiError } from '../api/client'
 import type {
   Finding,
+  FindingGroup,
   FindingScope,
   JobRun,
   Severity,
@@ -11,13 +12,14 @@ import type {
 } from '../api/types'
 import { useAuthStore } from '../stores/auth'
 import { useToastStore } from '../stores/toast'
-import FindingTable from '../components/FindingTable.vue'
+import FindingGroups from '../components/FindingGroups.vue'
 import ScopeTabs from '../components/ScopeTabs.vue'
 
 const auth = useAuthStore()
 const toast = useToastStore()
 const summary = ref<VulnSummary | null>(null)
-const findings = ref<Finding[]>([])
+const groups = ref<FindingGroup[]>([])
+const groupsRef = ref<InstanceType<typeof FindingGroups> | null>(null)
 const targets = ref<TargetSummary[]>([])
 const scope = ref<FindingScope>('host')
 const minSeverity = ref<Severity>('low')
@@ -36,14 +38,26 @@ async function load() {
   q.set('min_severity', minSeverity.value)
   if (target.value) q.set('target', target.value)
   if (status.value) q.set('status', status.value)
-  const [s, f, t] = await Promise.all([
+  const [s, g, t] = await Promise.all([
     api.get<VulnSummary>('/api/vulnerabilities/summary'),
-    api.get<Finding[]>(`/api/vulnerabilities?${q}`),
+    api.get<FindingGroup[]>(`/api/vulnerabilities/groups?${q}`),
     api.get<TargetSummary[]>('/api/vulnerabilities/targets'),
   ])
   summary.value = s
-  findings.value = f
+  groups.value = g
   targets.value = t
+  groupsRef.value?.reset()
+}
+
+/** Findings of one group, loaded when its row is expanded. */
+async function loadGroup(group: FindingGroup): Promise<Finding[]> {
+  const q = new URLSearchParams()
+  q.set('scope', scope.value)
+  q.set('min_severity', minSeverity.value)
+  if (status.value) q.set('status', status.value)
+  if (group.kind === 'image') q.set('target', group.key)
+  else q.set('package', group.key)
+  return api.get<Finding[]>(`/api/vulnerabilities?${q}`)
 }
 
 /// Targets of the selected category, for the filter dropdown.
@@ -85,7 +99,8 @@ async function scan() {
 async function setStatus(f: Finding, s: 'open' | 'acknowledged') {
   try {
     await api.post(`/api/vulnerabilities/${f.id}/status`, { status: s })
-    await load()
+    f.status = s
+    if (status.value) await load()
   } catch (e) {
     fail(e)
   }
@@ -172,15 +187,18 @@ async function setStatus(f: Finding, s: 'open' | 'acknowledged') {
       </select>
     </div>
     <span class="pb-2 text-sm text-gray-500">
-      {{ findings.length }} {{ scope === 'host' ? 'host' : 'container' }} findings
+      {{ groups.length }} {{ scope === 'host' ? 'packages' : 'images' }} ·
+      {{ groups.reduce((n: number, g: FindingGroup) => n + g.total, 0) }} findings
     </span>
   </div>
 
-  <FindingTable
+  <FindingGroups
+    ref="groupsRef"
     class="mt-4"
-    :findings="findings"
+    :groups="groups"
     :scope="scope"
     :can-act="auth.isAdmin"
+    :load="loadGroup"
     @status="setStatus"
     @select="selected = $event"
   />