CVE-2026-29793: Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript

Q: How do I fix CVE-2026-29793?

feathers: upgrade to 5.0.42. Exact commands for each OS are on this page.

Q: Is CVE-2026-29793 being exploited?

CVE-2026-29793 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-29793 affect?

CVE-2026-29793 affects feathers. Severity is critical (CVSS 9.8). 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, p

Q: How urgent is CVE-2026-29793?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-29793 is a critical-severity flaw (CVSS 9.8) affecting feathers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-943
Published	2026-03-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: feathersjs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-10 20:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

feathersjs feathers UPGRADE

Affected: >= 5.0.0 and < 5.0.42

Fixed in: 5.0.42

Safe to downgrade to: a release before 5.0.0

1. Check installed version

npm ls feathers

2. UPGRADE to 5.0.42

npm install feathers@">=5.0.42"

3. If no update is available yet, DOWNGRADE to a release before 5.0.0

npm view feathers versions npm install feathers@"<5.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29793?

feathers: upgrade to 5.0.42. Exact commands for each OS are on this page.

Is CVE-2026-29793 being exploited?

CVE-2026-29793 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29793 affect?

CVE-2026-29793 affects feathers. Severity is critical (CVSS 9.8). 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, p

How urgent is CVE-2026-29793?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

MongoDB vulnerabilities

Related CVEs

CVE-2026-29792 CRITICAL 9.8 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-27193 MEDIUM 5.3 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-27192 HIGH 8.1 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-27191 MEDIUM 6.1 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript

References

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