CVE-2026-29091: Locutus

High severity, CVSS 8.1. EPSS: 1% chance of exploitation in the next 30 days.

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 products

• Locutus Locutus: before 3.0.0 (fixed in 3.0.0)

Published 2026-03-06. Last modified 2026-07-15.