{"cve":"CVE-2026-54335","nvd":{"published":"2026-07-17T22:17:44.840","modified":"2026-10-24T20:10:00.137","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-1321"],"references":["https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc","https://github.com/feathersjs/feathers/pull/3690","https://github.com/feathersjs/feathers/releases/tag/v5.0.45","https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh"],"products":[],"source":"nvd","synced_at":"2026-10-25T17:50:08.599881581+00:00"},"epss":{"cve":"CVE-2026-54335","score":0.00389,"percentile":0.32729,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-28xv-ph75-77wh","url":"https://osv.dev/vulnerability/GHSA-28xv-ph75-77wh","summary":"Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__","modified":"2026-07-14T19:56:45.565577Z","packages":[{"ecosystem":"npm","name":"@feathersjs/commons","purl":"pkg:npm/%40feathersjs/commons","ranges":["<5.0.45"],"fixed":["5.0.45"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}