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BIT-mongoose-2026-73562 — Mongoose: Prototype pollution in the update casting via proto-prefixed dotted path (Schema._getSchema/path getter)

Affected: Bitnami: mongoose

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOne(filter, req.body) can exploit Mongoose update casting with a __proto__.x dotted path under $set. Schema.prototype.path and Schema.prototype._getPathType can treat inherited properties of schema.paths and schema.nested as schema types, allowing the casting process to set $fullPath and $parentSchemaDocArray on Object.prototype before throwing. This prototype pollution makes those properties visible on newly created objects and can cause application integrity and availability impacts. This issue is fixed in versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2.

EUVD-2026-352839

fkie_cve-2026-73562

GHSA-664h-wqgq-64gw — Mongoose: Prototype pollution in mongoose update casting via proto-prefixed dotted path (Schema._getSchema/path get…

Affected: npm: mongoose

### Impact _What kind of vulnerability is it? Who is impacted?_

Prototype pollution in update casting: passing a user-controlled update to a Mongoose update, like `MyModel.updateOne(filter, req.body)`, can cause Mongoose to set `$fullPath` and `$parentSchemaDocArray` on `Object.prototype`.

Example:

```javascript const mongoose = require('mongoose'); console.log('before:', Object.prototype.$fullPath); // undefined

const User = mongoose.model('User', new mongoose.Schema({ name: String })); const malicious = JSON.parse('{"$set": {"__proto__.x": "anything"}}'); // attacker-controlled update

const q = User.updateOne({}, {}); try { q._castUpdate(malicious); } catch (e) { /* throws AFTER the pollution side-effect */ }

console.log('after :', Object.prototype.$fullPath); // "__proto__" console.log('enumerable:', Object.prototype.propertyIsEnumerable('$fullPath')); // true console.log('fresh {}:', ({}).$fullPath); // "__proto__" ```

### Patches _Has the problem been patched? What versions should users upgrade to?_

9.7.2, 8.24.1. 7.8.10, 6.13.10

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_

Check user-controlled updates for own `__proto__` properties before passing to Mongoose

### References _Are there any links users can visit to find out more?_

Most recent entries from all

BIT-mongoose-2026-73562 — Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)

EUVD-2026-352839

fkie_cve-2026-73562

GHSA-664h-wqgq-64gw — Mongoose: Prototype pollution in mongoose update casting via __proto__-prefixed dotted path (Schema._getSchema/path get…

BIT-mongoose-2026-73562 — Mongoose: Prototype pollution in the update casting via proto-prefixed dotted path (Schema._getSchema/path getter)

GHSA-664h-wqgq-64gw — Mongoose: Prototype pollution in mongoose update casting via proto-prefixed dotted path (Schema._getSchema/path get…