diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d15d2b..fbe561f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,9 +27,15 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version-file: .nvmrc
+          check-latest: true
           cache: npm
 
+      # Fails on a Node.js whose bundled Brotli is vulnerable to
+      # CVE-2026-111497 (see FIXED in scripts/check-node-version.js).
+      - name: Check Node.js version
+        run: node scripts/check-node-version.js
+
       - name: Install dependencies
         run: npm ci
 
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 311d1bc..b259c3f 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -29,9 +29,15 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version-file: .nvmrc
+          check-latest: true
           cache: npm
 
+      # Fails on a Node.js whose bundled Brotli is vulnerable to
+      # CVE-2026-111497 (see FIXED in scripts/check-node-version.js).
+      - name: Check Node.js version
+        run: node scripts/check-node-version.js
+
       - name: Install dependencies
         run: npm ci
 
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/package.json b/package.json
index c35f718..67a2bb0 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "license": "BSD-3-Clause",
   "scripts": {
     "docusaurus": "docusaurus",
-    "generate": "node scripts/fetch-profile-readme.js",
+    "generate": "node scripts/check-node-version.js && node scripts/fetch-profile-readme.js",
     "prestart": "npm run generate",
     "start": "docusaurus start",
     "prebuild": "npm run generate",
@@ -39,6 +39,6 @@
     ]
   },
   "engines": {
-    "node": ">=20.0"
+    "node": "^22.23.4 || ^24.22.1 || ^26.12.1"
   }
 }
diff --git a/scripts/check-node-version.js b/scripts/check-node-version.js
new file mode 100644
index 0000000..610b733
--- /dev/null
+++ b/scripts/check-node-version.js
@@ -0,0 +1,37 @@
+// Fails if the running Node.js bundles a Brotli decoder vulnerable to
+// CVE-2026-111497 ("Node2Shell"): a crafted Brotli stream can corrupt
+// memory in whatever decompresses it, and the build decompresses one —
+// fetch() in fetch-profile-readme.js accepts `Content-Encoding: br`.
+// Runs first in ci.yml and deploy.yml (before npm ci),
+// and again via npm run generate.
+//
+// Only release lines with a fix are accepted, each from its first fixed
+// version. Node 20 never got a fix, and odd lines (23, 25) are end of life.
+// To move to a new line, add its first fixed version here, then update
+// engines in package.json and .nvmrc.
+// https://www.aikido.dev/blog/python-packages-vulnerable-node2shell-brotli-cve-2026-111497
+
+const FIXED = {
+  22: [22, 23, 4],
+  24: [24, 22, 1],
+  26: [26, 12, 1],
+};
+
+function isFixed(version) {
+  const parts = version.replace(/^v/, '').split('.').map(Number);
+  const minimum = FIXED[parts[0]];
+  if (!minimum) return false;
+  for (let i = 1; i < 3; i++) {
+    if (parts[i] !== minimum[i]) return parts[i] > minimum[i];
+  }
+  return true;
+}
+
+if (require.main === module) {
+  if (!isFixed(process.version)) {
+    const accepted = Object.values(FIXED).map((v) => `>=${v.join('.')}`).join(', ');
+    console.error(`check-node-version.js: Node ${process.version} is vulnerable to CVE-2026-111497; use one of ${accepted}`);
+    process.exit(1);
+  }
+  console.log(`check-node-version.js: Node ${process.version} is not affected by CVE-2026-111497`);
+}