---
title: "CVE-2026-29793: Feathers has a NoSQL Injection via WebSocket id Parameter in MongoDB Adapter"
url: https://erroneo.us/security/cve/CVE-2026-29793/
description: "CVE-2026-29793 (@feathersjs/mongodb (npm)): Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-10
date_modified: 2026-03-11
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-29793"
kev: false
cvss: 9.3
epss: 0.00586
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-29793: Feathers has a NoSQL Injection via WebSocket id Parameter in MongoDB Adapter

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 47: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 47% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @feathersjs/mongodb (npm) >= 5.0.0, <= 5.0.41, fixed in 5.0.42 . Check your lockfile, including transitive dependencies.

## What it is

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

- npm `@feathersjs/mongodb` >= 5.0.0, <= 5.0.41 → fixed: 5.0.42

## Affected products (CVE record)

- @feathersjs mongodb: >= 5.0.0, < 5.0.42

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.59% probability of exploitation activity in the next 30 days; percentile 47.

## Sources

- [GitHub Advisory GHSA-p9xr-7p9p-gpqx](https://github.com/advisories/GHSA-p9xr-7p9p-gpqx)
- [CVE.org record CVE-2026-29793](https://www.cve.org/CVERecord?id=CVE-2026-29793)
- [NVD entry CVE-2026-29793](https://nvd.nist.gov/vuln/detail/CVE-2026-29793)
- [github.com](https://github.com/feathersjs/feathers/security/advisories/GHSA-p9xr-7p9p-gpqx)

---
Source page: https://erroneo.us/security/cve/CVE-2026-29793/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt