{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54335","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-12T19:23:22.316Z","datePublished":"2026-07-17T20:56:51.857Z","dateUpdated":"2026-07-20T17:38:02.512Z"},"containers":{"cna":{"title":"Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__","problemTypes":[{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"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"}}],"references":[{"name":"https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh"},{"name":"https://github.com/feathersjs/feathers/pull/3690","tags":["x_refsource_MISC"],"url":"https://github.com/feathersjs/feathers/pull/3690"},{"name":"https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc","tags":["x_refsource_MISC"],"url":"https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc"},{"name":"https://github.com/feathersjs/feathers/releases/tag/v5.0.45","tags":["x_refsource_MISC"],"url":"https://github.com/feathersjs/feathers/releases/tag/v5.0.45"}],"affected":[{"vendor":"feathersjs","product":"feathers","versions":[{"version":"< 5.0.45","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-17T20:56:51.857Z"},"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."}],"source":{"advisory":"GHSA-28xv-ph75-77wh","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-20T17:38:02.512Z"}}]}}