CVE-2026-25521

Summary

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.

Affected Software

Weaknesses

• CWE-1321: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

locutus: Locutus is vulnerable to Prototype Pollution

Additional References

• https://access.redhat.com/security/cve/CVE-2026-25521
• https://bugzilla.redhat.com/show_bug.cgi?id=2436950
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25521.json

References

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

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