CVE-2026-25521

HIGH

8.8

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.

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/4/2026

Last Modified2/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

locutus:locutus

Weaknesses (CWE)

CWE-1321

References

https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c(security-advisories@github.com)

https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.