Remote code execution via unchecked callback method
Published Mar 6, 2026 · Updated Mar 6, 2026
Eval injection in Locutus before 3.0.0 allows remote attackers to execute arbitrary JavaScript through a crafted array callback. The call_user_func_array function validates the callback's class element but interpolates its unchecked method element into an eval expression. Exploitation requires an application gateway or router to pass attacker-controlled array callbacks, after which code runs with the Node.js process's privileges.
Summary
What happened
Eval injection in Locutus before 3.0.0 allows remote attackers to execute arbitrary JavaScript through a crafted array callback. The call_user_func_array function validates the callback's class element but interpolates its unchecked method element into an eval expression. Exploitation requires an application gateway or router to pass attacker-controlled array callbacks, after which code runs with the Node.js process's privileges.
The record
- CVE
- CVE-2026-29091
- Published
- Mar 6, 2026
- Updated
- Mar 6, 2026
- Vendor
- Locutus
- Product
- Locutus
- Classifications
- CWE-95, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 6, 2026CVE publishedPublication date reported by the CVE source.
- Mar 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-fp25-p6mj-qqg6 proof of conceptproof of concept · demonstrated
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Reported exploitation
- Upstream report of exploitation in practicereported exploitation
Technologies
Your stack
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Your stack
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