{"id":"CVE-2026-25521","aliases":["GHSA-rxrv-835q-v5mh"],"url":"https://o3.security/vulnerability/CVE-2026-25521","summary":"Locutus is vulnerable to Prototype Pollution","details":"Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.","published":"2026-02-04T21:20:32.643Z","modified":"2026-08-12T03:51:17.101826187Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"locutus","fixedVersion":"2.0.39"}],"fix":{"url":"https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c","label":"locutusjs/locutus@042af9c"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25521.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-25521"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25521.json"},{"type":"ADVISORY","url":"https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25521"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2436950"},{"type":"FIX","url":"https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:17.101826187Z"}}