CVE-2026-29091

Summary

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.0, a remote code execution (RCE) flaw was discovered in the locutus project, specifically within the call_user_func_array function implementation. The vulnerability allows an attacker to inject arbitrary JavaScript code into the application's runtime environment. This issue stems from an insecure implementation of the call_user_func_array function (and its wrapper call_user_func), which fails to properly validate all components of a callback array before passing them to eval(). This issue has been patched in version 3.0.0.

Affected Software

Weaknesses

• CWE-95: CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/locutusjs/locutus/security/advisories/GHSA-fp25-p6mj-qqg6

locutus: Locutus: Remote Code Execution via insecure callback function implementation

Additional References

• https://access.redhat.com/security/cve/CVE-2026-29091
• https://bugzilla.redhat.com/show_bug.cgi?id=2445262
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29091.json

References

• https://github.com/locutusjs/locutus/security/advisories/GHSA-fp25-p6mj-qqg6
• https://github.com/locutusjs/locutus/commit/977a1fb169441e35996a1d2465b512322de500ad

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