Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

CVE-2026-29793NoSQL Injection via WebSocket id Parameter in MongoDB Adapter

Critical 9.3

In plain English

A critical-severity security flaw in mongodb from @feathersjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.5%top 56.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@feathersjs/mongodb	5.0.42	GHSA-p9xr-7p9p-gpqx

Affected products (as reported)

Vendor	Product	Versions
@feathersjs	mongodb	>= 5.0.0, < 5.0.42

Weakness: CWE-943 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/feathersjs/feathers/security/advisories/GHSA-p9xr-7p9p-gpqx x_refsource_CONFIRM