diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..ce62013
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+24.22.1
diff --git a/package-lock.json b/package-lock.json
index a6b3b0c..03e15f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "miriamgemeinde",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "miriamgemeinde",
-      "version": "1.1.0",
+      "version": "1.1.1",
       "dependencies": {
         "@iconoir/vue": "^7.7.0",
         "@tiptap/extension-bold": "^3.22.2",
@@ -59,6 +59,9 @@
         "nodemon": "^3.1.3",
         "vite": "^8.0.7",
         "vue-eslint-parser": "^9.4.3"
+      },
+      "engines": {
+        "node": "^22.23.4 || ^24.22.1 || ^26.12.1"
       }
     },
     "node_modules/@babel/helper-string-parser": {
diff --git a/package.json b/package.json
index afe1e38..f701831 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "miriamgemeinde",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "private": true,
   "scripts": {
     "dev": "vite",
@@ -86,5 +86,8 @@
     "last 2 versions",
     "not dead",
     "not ie 11"
-  ]
+  ],
+  "engines": {
+    "node": "^22.23.4 || ^24.22.1 || ^26.12.1"
+  }
 }
diff --git a/scripts/require-safe-node.cjs b/scripts/require-safe-node.cjs
new file mode 100644
index 0000000..b5c7311
--- /dev/null
+++ b/scripts/require-safe-node.cjs
@@ -0,0 +1,22 @@
+// CVE-2026-111497: Node's bundled Brotli decoder must include the security fix.
+// Check Node versions: patched releases can still report Brotli 1.2.0.
+// https://nodejs.org/en/blog/vulnerability/october-2026-security-releases
+'use strict';
+
+function requireSafeNode() {
+  const [major, minor, patch] = process.versions.node.split('.').map(Number);
+  const minimum = { 22: [23, 4], 24: [22, 1], 26: [12, 1] }[major];
+  const patched = minimum && (minor > minimum[0] ||
+    (minor === minimum[0] && patch >= minimum[1]));
+
+  if (!patched) {
+    throw new Error(
+      `CVE-2026-111497: Node.js ${process.versions.node} is not an approved patched runtime. ` +
+      'Use Node.js 22.23.4+, 24.22.1+ or 26.12.1+ within those release lines. ' +
+      'Recommended: nvm install && nvm use (see .nvmrc). Restart all server/PM2 processes after upgrading.'
+    );
+  }
+}
+
+requireSafeNode();
+module.exports = requireSafeNode;
diff --git a/server.js b/server.js
index e517ea0..9edd992 100644
--- a/server.js
+++ b/server.js
@@ -1,3 +1,4 @@
+require('./scripts/require-safe-node.cjs');
 const express = require('express');
 const bodyParser = require('body-parser');
 const cors = require('cors');