CVE-2026-29793

critical · 9.3

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.

9.3

CVSS

0.5%

EPSS (exploit prob.)

39th

EPSS percentile

2026-03-10

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-943

Affected products

Vendor	Product	Affected versions
feathersjs	feathers	>= 5.0.0, < 5.0.42

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-29793