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CVE-2026-29091

Locutus remote code execution

8.1 HIGHPublic exploitEPSS 1.02%
  1. Published6 Mar 2026

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 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Locutus< 3.0.0

Remediation

Fixed in
Locutus≥ 3.0.0

References

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Frequently asked

Is CVE-2026-29091 being actively exploited?

CVE-2026-29091 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.02%.

How severe is CVE-2026-29091?

CVE-2026-29091 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 1.02% probability of exploitation.

Which products are affected by CVE-2026-29091?

Affected products include Locutus.

How do I fix CVE-2026-29091?

Upgrade affected software to a fixed version, for example Locutus 3.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-29091 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.