CVE-2026-54335
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @feathersjs/commons | <= 5.0.44 | 5.0.45 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-28xv-ph75-77wh
- 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