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Locutus CVE-2026-25521

HIGH
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-02-04 security-advisories@github.com GHSA-rxrv-835q-v5mh
Code Injection Locutus Red Hat
8.8
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
8.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Red Hat
9.3 CRITICAL
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

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

DescriptionGitHub Advisory

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.

AnalysisAI

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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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft input exploiting String.prototype methods
Exploit
Bypass prototype pollution check
Execution
Pollute Object.prototype
Impact
Achieve arbitrary code execution
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Vulnerability AssessmentAI

Exploitation Locutus versions 2.0.12 to 2.0.38 with local user access required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running Locutus versions up to 2.0.39 and assess exposure in production environments. …

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Vendor StatusVendor

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CVE-2026-25521 vulnerability details – vuln.today
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