Feathers has a NoSQL Injection via WebSocket id Parameter in MongoDB Adapter

CRITICAL 9.8CVE-2026-29793 · GHSA-p9xr-7p9p-gpqx · Published 10/03/2026 · updated 17/06/2026

Package	Affected versions	Patched versions
feathers feathersjs	`≥ 5.0.0, < 5.0.42`	`5.0.42`
@feathersjs/mongodb npm	`≥ 5.0.0, < 5.0.42`	`5.0.42`

Description

Socket.IO clients can send arbitrary JavaScript objects as the id argument to any service method (get, patch, update, remove). The transport layer performs no type checking on this argument. When the service uses the MongoDB adapter, these objects pass through getObjectId() and land directly in the MongoDB query as operators. Sending {$ne: null} as the id matches every document in the collection.

NVD description

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, Socket.IO clients can send arbitrary JavaScript objects as the id argument to any service method (get, patch, update, remove). The transport layer performs no type checking on this argument. When the service uses the MongoDB adapter, these objects pass through getObjectId() and land directly in the MongoDB query as operators. Sending {$ne: null} as the id matches every document in the collection. This vulnerability is fixed in 5.0.42.

References

feathersjs/feathers security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-29793 · ADVISORY
feathersjs/feathers · PACKAGE

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free