CVE-2026-29091

Q: How do I fix CVE-2026-29091?

Upgrade locutus to 3.0.0 or later.

Q: Is CVE-2026-29091 being actively exploited?

Not that we know of. CVE-2026-29091 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

Q: How severe is CVE-2026-29091?

CVE-2026-29091 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-29091 affect?

Published advisories record a fix for locutus (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

8.1

CVSS v3

NVD

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.

CWE-95 CWE-94Code Injection

How to fix

Remediation Available

locutusNVD

Affected:< 3.0.0Fixed in:3.0.0CVE-2026-29091derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.78%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Other references3

Related Vulnerabilities

Other CWE-95 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-24893	Critical	9.8	100%	KEV	Fix
CVE-2026-33017	Critical	9.8	100%	KEV	Fix
CVE-2024-36401	Critical	9.8	100%	KEV	Fix
CVE-2024-21650	Critical	10.0	93%	-	-
CVE-2023-37462	Critical	9.9	91%	-	Fix
CVE-2024-7954	Critical	9.8	90%	-	Fix

Common questions

How do I fix CVE-2026-29091?

Upgrade locutus to 3.0.0 or later.

Is CVE-2026-29091 being actively exploited?

Not that we know of. CVE-2026-29091 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

How severe is CVE-2026-29091?

CVE-2026-29091 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-29091 affect?

Published advisories record a fix for locutus (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-29091

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.