CVE-2026-4198 identifies a command injection vulnerability in the hypermodel-labs mcp-server-auto-commit software, version 1.0.0. The vulnerability resides in the getGitChanges function within the index.ts file, where insufficient input validation allows an attacker to inject and execute arbitrary shell commands. This flaw is exploitable only by an attacker with local access and low privileges, meaning remote exploitation is not feasible without prior system access. The vulnerability does not require user interaction, and the attack complexity is low given local access. The CVSS 4.0 vector indicates local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The vulnerability was responsibly disclosed early to the vendor, but no official patch release or response has been made; however, a patch commit (f7d992c830c5f2ec5749852e66c0195e3ed7fe30) is available. No known exploits have been observed in the wild yet. This vulnerability could allow local attackers to escalate privileges or execute arbitrary commands, potentially compromising the host system or interfering with automated commit processes.

The primary impact of CVE-2026-4198 is the potential for local attackers to execute arbitrary commands on systems running the vulnerable mcp-server-auto-commit 1.0.0 software. This can lead to unauthorized access, privilege escalation, data tampering, or disruption of automated commit workflows. While the attack requires local access, in environments where multiple users share systems or where attackers have gained limited footholds, this vulnerability could be leveraged to deepen system compromise. Organizations relying on this tool in their development or CI/CD pipelines may face risks of codebase integrity violations or operational disruptions. The limited scope of remote exploitation reduces the global threat surface, but insider threats or attackers with initial access could exploit this flaw. The absence of vendor response increases the risk of delayed remediation, potentially exposing affected environments longer to exploitation attempts.

To mitigate CVE-2026-4198, organizations should immediately apply the available patch identified by commit f7d992c830c5f2ec5749852e66c0195e3ed7fe30 to the mcp-server-auto-commit 1.0.0 software. Until patched, restrict local access to systems running this software to trusted users only and implement strict access controls and monitoring to detect suspicious command executions. Employ application whitelisting and endpoint detection and response (EDR) solutions to identify anomalous behaviors related to command injection attempts. Review and harden CI/CD pipeline permissions to limit the impact of potential exploitation. Additionally, consider isolating the mcp-server-auto-commit service in containerized or sandboxed environments to reduce the blast radius of any compromise. Regularly audit logs for unusual git commit or command execution activities. Engage with hypermodel-labs or the community for updates and monitor for official patches or advisories.