CVE-2026-25521 — Locutus is vulnerable to Prototype Pollution
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 exist…
Published: 2026-02-04 · CVSS: 9.4 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7