Locutus: Remote Code Execution (RCE) in locutus call_user_func_array due to Code Injection (CVE-2026-29091) | HOL Guard CVE

High · CVSS 8.1CVE-2026-29091

Locutus: Remote Code Execution (RCE) in locutus call_user_func_array due to Code Injection

Answer in brief

CVE-2026-29091 records a High severity (CVSS 8.1) vulnerability in Locutus: Remote Code Execution (RCE) in locutus call_user_func_array due to Code Injection. The current sources do not mark it as known exploited. The current feed maps locutusjs/locutus (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 6, 2026Updated Jul 15, 2026Source checked Sep 19, 2026First seen by HOL Jul 15, 2026Material review Jul 15, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps locutusjs/locutus (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
locutusjs/locutusgeneric	< 3.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for locutusjs/locutus.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Mar 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.