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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
locutusjs locutus
>= 2.0.12, < 2.0.39affected
References
- https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh ↗
- https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c ↗
- 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 ↗