Arbitrary Object Injection in Feathersjs Framework by Socket.IO Clients
CVE-2026-29793

9.3CRITICAL

Key Information:

Vendor

@feathersjs

Status
Mongodb
Vendor
CVE Published:
10 March 2026

What is CVE-2026-29793?

The Feathersjs framework allows Socket.IO clients to send arbitrary JavaScript objects as identifiers to service methods, which can be exploited due to a lack of type verification. This vulnerability permits users to inject operators directly into MongoDB queries, enabling them to match all documents in a collection with a malicious query, such as {$ne: null}. This potentially exposes sensitive data and compromises the integrity of the application's database. The issue is resolved in version 5.0.42.

Affected Version(s)

mongodb >= 5.0.0, < 5.0.42

References

https://github.com/feathersjs/feathers/security/advisorie...
x_refsource_CONFIRM

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.