{"id":"CVE-2026-25521","revision":"cd85cadbbedc4f72ace3edbbdf8da73d","records":[{"revision":"cd85cadbbedc4f72ace3edbbdf8da73d","observedAt":"2026-10-25T06:17:16.233+00:00","statement":{"source":"nvd","id":"CVE-2026-25521","aliases":[],"title":"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…","description":"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.","state":0,"publishedAt":"2026-02-04T22:15:59.203+00:00","modifiedAt":"2026-07-15T02:18:53.903+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9.4,"severity":"CRITICAL"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3,"severity":"CRITICAL"}],"references":["https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c","https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh","https://access.redhat.com/security/cve/CVE-2026-25521","https://bugzilla.redhat.com/show_bug.cgi?id=2436950","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25521.json"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-25521","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-1321","CWE-915"],"productCriteria":["cpe:2.3:a:locutus:locutus:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-02-04T22:15:59.203","lastModified":"2026-07-15T02:18:53.903"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-25521","identifiers":["CVE-2026-25521"]},"retained":false,"historicalAffected":[]}],"coverage":[]}