diff --git a/.changeset/exact-node-security-pins.md b/.changeset/exact-node-security-pins.md
new file mode 100644
index 0000000..4536f9c
--- /dev/null
+++ b/.changeset/exact-node-security-pins.md
@@ -0,0 +1,7 @@
+---
+"@kethalia/workflows": patch
+---
+
+Allow exact Node.js security versions through a string `node-version-spec` input
+in the build/lint/test and quality workflows. Preserve the existing numeric
+`node-version` input for callers selecting a major version.
diff --git a/.github/fixtures/node-version-coverage.cjs b/.github/fixtures/node-version-coverage.cjs
new file mode 100644
index 0000000..67dd759
--- /dev/null
+++ b/.github/fixtures/node-version-coverage.cjs
@@ -0,0 +1,11 @@
+// Synthetic artifacts for the workflow's upload/download contract, not project coverage.
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+
+assert.match(process.version, /^v22\./);
+const metric = { total: 0, covered: 0, skipped: 0, pct: 100 };
+fs.mkdirSync('coverage', { recursive: true });
+fs.writeFileSync('coverage/coverage-summary.json', JSON.stringify({
+  total: { lines: metric, statements: metric, functions: metric, branches: metric },
+}));
+fs.writeFileSync('coverage/coverage-final.json', '{}');
diff --git a/.github/workflows/ci-build-lint-test.yml b/.github/workflows/ci-build-lint-test.yml
index 30f56cf..1a60223 100644
--- a/.github/workflows/ci-build-lint-test.yml
+++ b/.github/workflows/ci-build-lint-test.yml
@@ -8,6 +8,11 @@ on:
         type: number
         required: false
         default: 22
+      node-version-spec:
+        description: Exact Node.js version or range; overrides the legacy numeric node-version
+        type: string
+        required: false
+        default: ""
       build-command:
         description: Build command (e.g., "pnpm build")
         type: string
@@ -86,12 +91,12 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - id: key
         name: Compute node_modules cache key
         run: |
-          echo "modules=${{ runner.os }}-node${{ inputs.node-version }}-modules-${{ hashFiles('**/pnpm-lock.yaml', '**/schema.prisma') }}" >> "$GITHUB_OUTPUT"
+          echo "modules=${{ runner.os }}-node${{ inputs.node-version-spec || inputs.node-version }}-modules-${{ hashFiles('**/pnpm-lock.yaml', '**/schema.prisma') }}" >> "$GITHUB_OUTPUT"
       - name: Cache node_modules
         id: modules-cache
         uses: actions/cache@v4
@@ -117,7 +122,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - name: Restore node_modules
         uses: actions/cache@v4
@@ -150,7 +155,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - name: Restore node_modules
         uses: actions/cache@v4
@@ -185,7 +190,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - name: Restore node_modules
         uses: actions/cache@v4
@@ -227,7 +232,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - name: Restore node_modules
         uses: actions/cache@v4
@@ -273,7 +278,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: pnpm
       - name: Restore node_modules
-        if: matrix.node-version == inputs.node-version
+        if: matrix.node-version == (inputs.node-version-spec || inputs.node-version)
         uses: actions/cache@v4
         with:
           path: |
@@ -297,7 +302,10 @@ jobs:
       - name: Run tests
         run: ${{ inputs.test-command }}
       - name: Upload coverage reports
-        if: matrix.node-version == inputs.node-version
+        if: >-
+          matrix.node-version == (inputs.node-version-spec || inputs.node-version) ||
+          (!contains(fromJson(inputs.test-node-versions), inputs.node-version-spec || inputs.node-version) &&
+           strategy.job-index == 0)
         uses: actions/upload-artifact@v4
         with:
           name: ${{ inputs.coverage-artifact-name }}
diff --git a/.github/workflows/ci-quality.yml b/.github/workflows/ci-quality.yml
index 016ac54..63e5aa3 100644
--- a/.github/workflows/ci-quality.yml
+++ b/.github/workflows/ci-quality.yml
@@ -8,6 +8,11 @@ on:
         type: number
         required: false
         default: 22
+      node-version-spec:
+        description: Exact Node.js version or range; overrides the legacy numeric node-version
+        type: string
+        required: false
+        default: ""
       verify-command:
         description: Package verification command (e.g., "pnpm validate:publish")
         type: string
@@ -72,7 +77,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - run: pnpm install --frozen-lockfile
       - name: Download build artifacts
@@ -96,7 +101,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
           cache: pnpm
       - run: pnpm install --frozen-lockfile
       - run: pnpm changeset status --since=origin/${{ inputs.base-branch }}
@@ -111,7 +116,7 @@ jobs:
     steps:
       - uses: kethalia/workflows/.github/actions/setup-pnpm@v4.0.0
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
       - run: pnpm audit --audit-level=${{ inputs.audit-level }}
 
   # -------------------------------------------------------------------------
@@ -124,7 +129,7 @@ jobs:
     steps:
       - uses: kethalia/workflows/.github/actions/setup-pnpm@v4.0.0
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
       - run: ${{ inputs.sherif-command }}
 
   # -------------------------------------------------------------------------
@@ -137,7 +142,7 @@ jobs:
     steps:
       - uses: kethalia/workflows/.github/actions/setup-pnpm@v4.0.0
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
       - run: ${{ inputs.knip-command }}
 
   # -------------------------------------------------------------------------
@@ -161,7 +166,7 @@ jobs:
     steps:
       - uses: kethalia/workflows/.github/actions/setup-pnpm@v4.0.0
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
       - run: ${{ inputs.cspell-command }}
 
   # -------------------------------------------------------------------------
@@ -174,5 +179,5 @@ jobs:
     steps:
       - uses: kethalia/workflows/.github/actions/setup-pnpm@v4.0.0
         with:
-          node-version: ${{ inputs.node-version }}
+          node-version: ${{ inputs.node-version-spec || inputs.node-version }}
       - run: ${{ inputs.madge-command }}
diff --git a/.github/workflows/internal-node-version-smoke.yml b/.github/workflows/internal-node-version-smoke.yml
new file mode 100644
index 0000000..25b66c6
--- /dev/null
+++ b/.github/workflows/internal-node-version-smoke.yml
@@ -0,0 +1,39 @@
+name: Internal — Node version compatibility
+
+on:
+  pull_request:
+    paths:
+      - .github/fixtures/node-version-coverage.cjs
+      - .github/workflows/ci-build-lint-test.yml
+      - .github/workflows/ci-quality.yml
+      - .github/workflows/internal-node-version-smoke.yml
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  exact:
+    uses: ./.github/workflows/ci-build-lint-test.yml
+    with:
+      node-version: 24
+      node-version-spec: '22.23.4'
+      build-command: node -e "require('node:assert/strict').equal(process.version, 'v22.23.4')"
+      test-command: node .github/fixtures/node-version-coverage.cjs
+      test-node-versions: '[22]'
+      artifact-paths: package.json
+
+  legacy:
+    uses: ./.github/workflows/ci-build-lint-test.yml
+    with:
+      node-version: 22
+      build-command: node -e "require('node:assert/strict').match(process.version, /^v22\./)"
+      artifact-paths: .github/no-build-artifact
+
+  quality:
+    uses: ./.github/workflows/ci-quality.yml
+    with:
+      node-version-spec: '22.23.4'
+      changeset-check: true
+      audit: false
diff --git a/README.md b/README.md
index 3ef22e2..f5cf8db 100644
--- a/README.md
+++ b/README.md
@@ -122,9 +122,15 @@ jobs:
 
 File: [`ci-build-lint-test.yml`](.github/workflows/ci-build-lint-test.yml). Build → lint → format → typecheck → test (matrix) pipeline with optional incremental build cache and artifact upload.
 
+Coverage comes from the matrix entry matching the effective setup version. If
+the matrix uses different selectors (for example `[22]` with an exact setup pin
+`22.23.4`), its first entry publishes coverage instead. Node modules are restored
+from the prepare cache only for an exact matching matrix entry.
+
 | Name | Type | Required | Default | Description |
 |---|---|---|---|---|
-| `node-version` | number | false | `22` | Node.js version |
+| `node-version` | number | false | `22` | Legacy major-version selector |
+| `node-version-spec` | string | false | `""` | Exact version or range, e.g. `"22.23.4"`; takes precedence over `node-version`. Set `test-node-versions` separately for build/test matrix jobs. |
 | `build-command` | string | true | — | Build command (e.g., "pnpm build") |
 | `lint-command` | string | false | `""` | Lint command (e.g., "pnpm lint") |
 | `format-command` | string | false | `""` | Format check command (e.g., "pnpm format:check") |
@@ -183,7 +189,8 @@ File: [`ci-quality.yml`](.github/workflows/ci-quality.yml). Aggregate quality ga
 
 | Name | Type | Required | Default | Description |
 |---|---|---|---|---|
-| `node-version` | number | false | `22` | Node.js version |
+| `node-version` | number | false | `22` | Legacy major-version selector |
+| `node-version-spec` | string | false | `""` | Exact version or range, e.g. `"22.23.4"`; takes precedence over `node-version`. Set `test-node-versions` separately for build/test matrix jobs. |
 | `verify-command` | string | false | `""` | Package verification command (e.g., "pnpm validate:publish") |
 | `changeset-check` | boolean | false | `true` | Whether to run changeset status check on PRs |
 | `base-branch` | string | false | `main` | Base branch for changeset comparison (e.g., "main") |