{"id":"CVE-2026-54335","state":"PUBLISHED","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.","publishedAt":"2026-07-17T20:56:51.857Z","updatedAt":"2026-07-20T17:38:02.512Z","severity":{"score":3.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["feathersjs feathers"],"affected":[{"vendor":"feathersjs","product":"feathers","versions":[{"version":"< 5.0.45","status":"affected"}]}],"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"],"weaknesses":["CWE-1321"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54335.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54335","state":"PUBLISHED","datePublished":"2026-07-17T20:56:51.857Z","dateUpdated":"2026-07-20T17:38:02.512Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-12T19:23:22.316Z"},"containers":{"cna":{"title":"Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__","descriptions":[{"lang":"en","value":"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":[{"vendor":"feathersjs","product":"feathers","versions":[{"version":"< 5.0.45","status":"affected"}]}],"references":[{"url":"https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh","name":"https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/feathersjs/feathers/pull/3690","name":"https://github.com/feathersjs/feathers/pull/3690","tags":["x_refsource_MISC"]},{"url":"https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc","name":"https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc","tags":["x_refsource_MISC"]},{"url":"https://github.com/feathersjs/feathers/releases/tag/v5.0.45","name":"https://github.com/feathersjs/feathers/releases/tag/v5.0.45","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-17T20:56:51.857Z"},"source":{"advisory":"GHSA-28xv-ph75-77wh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T17:37:43.562350Z","id":"CVE-2026-54335","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T17:38:02.512Z"}}]}}}