CVE-2026-54335
CVE-2026-54335 · Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target['__proto__'] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45.
CVSS 3.7 · Low · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
feathers
- Versions
- < 5.0.45: Affected
No fix published
@feathersjs/commons npm
- Affected ranges
- SEMVER: < 5.0.45
Update to 5.0.45
Original sources
- https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh
- https://github.com/feathersjs/feathers/pull/3690
- https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc
- https://github.com/feathersjs/feathers/releases/tag/v5.0.45
- https://nvd.nist.gov/vuln/detail/CVE-2026-54335