diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..4f206a4
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,41 @@
+---
+# Advanced setup: default setup cannot select javascript-typescript here
+# because the UI scripts live inside index.html rather than a .js file.
+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron: "24 4 * * 1"
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze ${{ matrix.language }}
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [c-cpp, javascript-typescript]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v4
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+
+      - name: Perform CodeQL analysis
+        uses: github/codeql-action/analyze@v4
+        with:
+          category: "/language:${{ matrix.language }}"