CVE-2026-4496 in Git-MCP-Server
Summary
by MITRE • 03/20/2026
A vulnerability was found in sigmade Git-MCP-Server up to 785aa159f262a02d5791a5d8a8e13c507ac42880. Affected by this vulnerability is the function child_process.exec of the file src/gitUtils.ts of the component show_merge_diff/quick_merge_summary/show_file_diff. The manipulation results in os command injection. The attack must be initiated from a local position. The exploit has been made public and could be used. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. It is advisable to implement a patch to correct this issue. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 03/27/2026
This vulnerability resides within the sigmade Git-MCP-Server software, specifically targeting the child_process.exec function implementation in the src/gitUtils.ts file. The flaw manifests in the show_merge_diff/quick_merge_summary/show_file_diff component where user-supplied input is directly passed to the operating system command execution function without proper sanitization or validation. This represents a classic operating system command injection vulnerability that allows malicious actors to execute arbitrary commands on the underlying system. The vulnerability is particularly concerning as it requires only local privilege escalation to exploit, making it accessible to anyone with access to the system where the software is running.
The technical implementation of this flaw involves the improper handling of user input within the gitUtils.ts file where the child_process.exec function is called with untrusted data. This function executes shell commands directly, bypassing normal input validation mechanisms and creating an attack surface where malicious payloads can be injected into the command execution chain. The vulnerability's impact is amplified by the rolling release nature of the software, which means that patches may not be immediately available and the continuous delivery model could potentially introduce new variants of the same flaw. According to CWE standards, this maps directly to CWE-78, which specifically addresses OS Command Injection vulnerabilities, and represents a critical weakness in the input validation and command execution processes.
The operational impact of this vulnerability extends beyond simple command execution as it provides attackers with potential access to the underlying system resources, file system operations, and network capabilities. Local attackers could leverage this vulnerability to escalate privileges, exfiltrate sensitive data, or establish persistent access points within the environment. The fact that the exploit has been made public significantly increases the risk profile, as it removes the element of surprise that typically protects against zero-day exploits. Given that the vendor has not responded to disclosure attempts, there is no official patch or mitigation guidance available, leaving affected organizations vulnerable to exploitation.
Organizations utilizing this software should immediately implement defensive measures to protect against potential exploitation. The most effective immediate mitigation involves modifying the code to replace child_process.exec with safer alternatives such as child_process.execFile or implementing proper input validation and sanitization before any command execution occurs. Additionally, implementing strict access controls and monitoring for unusual command execution patterns can help detect potential exploitation attempts. Network segmentation and privilege separation should be enforced to limit the potential impact if exploitation occurs. The rolling release model of the software makes continuous monitoring and rapid response protocols essential, as the lack of versioned releases complicates traditional patch management approaches and requires more dynamic security response strategies. Security teams should also consider implementing application whitelisting and behavioral analysis tools to detect anomalous command execution patterns that may indicate exploitation attempts.