diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d903d5..a5ffea4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,6 +11,9 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
+  security-codeql:
+    uses: ./.github/workflows/security-codeql.yml
+
   test-unit:
     uses: ./.github/workflows/test-unit.yml
 
@@ -37,3 +40,6 @@ jobs:
 
   lint-python:
     uses: ./.github/workflows/lint-python.yml
+
+  lint-docker:
+    uses: ./.github/workflows/lint-docker.yml
diff --git a/.github/workflows/lint-docker.yml b/.github/workflows/lint-docker.yml
new file mode 100644
index 0000000..f54f2d7
--- /dev/null
+++ b/.github/workflows/lint-docker.yml
@@ -0,0 +1,40 @@
+name: Docker Linter
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  lint-docker:
+    name: Lint Dockerfile
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run hadolint (produce SARIF)
+        id: hadolint
+        continue-on-error: true
+        uses: hadolint/hadolint-action@2332a7b74a6de0dda2e2221d575162eba76ba5e5
+        with:
+          dockerfile: ./Dockerfile
+          format: sarif
+          output-file: hadolint-results.sarif
+          failure-threshold: warning
+
+      - name: Upload analysis results to GitHub
+        if: always()
+        uses: github/codeql-action/upload-sarif@v4
+        with:
+          sarif_file: hadolint-results.sarif
+          wait-for-processing: true
+          category: hadolint
+
+      - name: Fail if SARIF contains warnings or errors
+        if: always()
+        run: python3 src/pkgmgr/github/check_hadolint_sarif.py hadolint-results.sarif
diff --git a/.github/workflows/security-codeql.yml b/.github/workflows/security-codeql.yml
new file mode 100644
index 0000000..8ebd171
--- /dev/null
+++ b/.github/workflows/security-codeql.yml
@@ -0,0 +1,47 @@
+name: CodeQL Advanced
+
+on:
+  workflow_call:
+
+jobs:
+  analyze:
+    name: Check security
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      packages: read
+      contents: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: actions
+            build-mode: none
+          - language: python
+            build-mode: none
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+          queries: security-extended,security-and-quality
+
+      - name: Run manual build steps
+        if: matrix.build-mode == 'manual'
+        shell: bash
+        run: |
+          echo 'If you are using a "manual" build mode for one or more of the' \
+            'languages you are analyzing, replace this with the commands to build' \
+            'your code.'
+          exit 1
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{ matrix.language }}"
diff --git a/src/pkgmgr/github/__init__.py b/src/pkgmgr/github/__init__.py
new file mode 100644
index 0000000..1da2028
--- /dev/null
+++ b/src/pkgmgr/github/__init__.py
@@ -0,0 +1 @@
+"""GitHub-related Python helpers for pkgmgr."""
diff --git a/src/pkgmgr/github/check_hadolint_sarif.py b/src/pkgmgr/github/check_hadolint_sarif.py
new file mode 100644
index 0000000..45053ce
--- /dev/null
+++ b/src/pkgmgr/github/check_hadolint_sarif.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+"""Fail when a hadolint SARIF report contains warnings or errors."""
+
+from __future__ import annotations
+
+import json
+import sys
+from pathlib import Path
+
+
+def main() -> int:
+    sarif_path = Path(sys.argv[1] if len(sys.argv) > 1 else "hadolint-results.sarif")
+
+    with sarif_path.open("r", encoding="utf-8") as handle:
+        sarif = json.load(handle)
+
+    results = sarif.get("runs", [{}])[0].get("results", [])
+    levels = [result.get("level", "") for result in results]
+    warnings = sum(1 for level in levels if level == "warning")
+    errors = sum(1 for level in levels if level == "error")
+
+    print(f"SARIF results: total={len(results)} warnings={warnings} errors={errors}")
+
+    return 1 if warnings + errors > 0 else 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())