CVE-2026-19329 in codex_mcp
Summary
by MITRE • 08/09/2026
A vulnerability was found in andreahaku codex_mcp up to 1ff521cc6cc57cfe56ddef946c644b8534771390. The affected element is an unknown function of the file src/codex-process-simple.ts of the component ask MCP Tool. The manipulation of the argument model results in command injection. The attack requires a local approach. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 08/09/2026
This vulnerability resides within the andreahaku codex_mcp repository, specifically targeting the ask MCP Tool component located in src/codex-process-simple.ts file. The flaw manifests as a command injection vulnerability that occurs when manipulating the model argument parameter, representing a critical security weakness that could enable unauthorized command execution on affected systems. The vulnerability's local attack requirement suggests that exploitation would need physical or administrative access to the target machine, though this does not diminish its potential impact on system integrity and confidentiality.
The technical implementation of this vulnerability stems from improper input validation within the unknown function responsible for processing model arguments. When user-supplied data is directly incorporated into command execution contexts without adequate sanitization or escaping mechanisms, attackers can inject malicious commands that will be executed with the privileges of the affected application. This pattern aligns with common command injection vulnerabilities classified under CWE-77 and follows attack patterns documented in the MITRE ATT&CK framework under T1059.001 for Command and Scripting Interpreter. The absence of version control practices within this project creates significant challenges for security assessment, as there is no reliable way to determine which versions contain the vulnerability or whether patches have been implemented.
The operational impact of this command injection vulnerability extends beyond simple data compromise, potentially allowing attackers to execute arbitrary system commands, escalate privileges, access sensitive files, and establish persistent backdoors within the affected environment. Given that this is a local attack vector, defenders must focus on privilege separation and access controls to limit potential exploitation surfaces. The lack of versioning information in the project repository creates additional operational challenges for security teams attempting to assess risk or implement remediation measures. The fact that the project maintainers have not responded to the issue report indicates potential security governance gaps within the development team, which could leave users exposed to ongoing risks.
Mitigation strategies should prioritize immediate implementation of input validation and sanitization measures within the affected function, ensuring all user-provided model arguments undergo strict parameter validation before being processed. Organizations should implement principle of least privilege access controls to limit local system access where possible, while also considering network segmentation to prevent lateral movement if exploitation occurs. Regular security assessments and code reviews should be mandated for this project to identify similar vulnerabilities in other components. The absence of version control necessitates maintaining detailed change logs and implementing automated vulnerability scanning processes that can detect such flaws during development cycles. Security teams should also consider implementing runtime monitoring solutions that can detect anomalous command execution patterns indicative of command injection attempts, providing additional defense-in-depth layers against this class of vulnerability.