CVE-2026-25521

HIGH
2026-02-04 [email protected] GHSA-rxrv-835q-v5mh
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 20, 2026 - 21:20 vuln.today
Public exploit code
Patch Released
Feb 20, 2026 - 21:20 nvd
Patch available
CVE Published
Feb 04, 2026 - 22:15 nvd
HIGH 8.8

Tags

Code Injection Locutus Redhat

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.

Analysis

Locutus versions up to 2.0.39 is affected by improperly controlled modification of object prototype attributes (prototype pollution) (CVSS 8.8).

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Remediation

Within 24 hours: Identify all systems running Locutus versions up to 2.0.39 and assess exposure in production environments. Within 7 days: Apply available vendor patch to all affected instances and validate successful deployment. …

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Priority Score

64
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +44
POC: +20

Vendor Status

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CVE-2026-25521 vulnerability details – vuln.today
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