CVE-2026-25521HIGH 8.8EPSS p14.4%

CVE-2026-25521CVE-2026-25521

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.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS0.24% probability of exploitation · percentile 14.4% · 2026-06-18T12:00:27Z
Published2026-02-04
Last modified2026-02-20

Underlying weaknesses· 1

CWE-1321

References

  1. https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c
  2. https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh

1

TypeTargetConfidenceTier
WeaknessImproperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')cwe-13210%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2026-33994
CVE
CVE-2026-29091
CVE
CVE-2026-32304
CVE
CVE-2026-33993
CVE
CVE-2025-13465
CVE
CVE-2026-46509
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.