CVE-2026-29091
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.78% probability · 54th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-95, CWE-94
- Affected
- locutus/locutus
- Source
- security-advisories@github.com
References
- https://github.com/locutusjs/locutus/commit/977a1fb169441e35996a1d2465b512322de500adPatch
- https://github.com/locutusjs/locutus/security/advisories/GHSA-fp25-p6mj-qqg6Exploit, Mitigation, Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-29091
- https://bugzilla.redhat.com/show_bug.cgi?id=2445262
- https://github.com/locutusjs/locutus/security/advisories/GHSA-fp25-p6mj-qqg6Exploit, Mitigation, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29091.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.