{"id":"CVE-2026-54335","revision":"f5b29534e22f442d8cb290ac8667137c","records":[{"revision":"f5b29534e22f442d8cb290ac8667137c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54335","aliases":[],"title":"Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__","description":"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.","state":0,"publishedAt":"2026-07-17T20:56:51.857+00:00","modifiedAt":"2026-07-20T17:38:02.512+00:00","affected":[{"ecosystem":"Vendor product","name":"feathers","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"feathersjs\",\n                    \"product\": \"feathers\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.0.45\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":3.7,"severity":"LOW"}],"references":["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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54335","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54335","identifiers":["CVE-2026-54335"]},"retained":false,"historicalAffected":[]}],"coverage":[]}