CVE-2026-4198 identifies a command injection vulnerability in the open-source project hypermodel-labs mcp-server-auto-commit, version 1.0.0. The vulnerability resides in the getGitChanges function within the index.ts file, where user-controllable input is improperly sanitized or validated before being passed to a system command execution context. This flaw enables an attacker with local access and low privileges (PR:L) to inject arbitrary commands, potentially leading to unauthorized code execution on the host system. The attack vector is local (AV:L), meaning remote exploitation is not feasible without prior access. No user interaction is required (UI:N), and the attack complexity is low (AC:L), indicating that an attacker with minimal technical skill could exploit the vulnerability once local access is obtained. The vulnerability impacts confidentiality, integrity, and availability at a low level (VC:L, VI:L, VA:L), reflecting the potential for limited but meaningful harm. The vulnerability was responsibly disclosed early to the project maintainers, but no response has been recorded. A patch identified by commit f7d992c830c5f2ec5749852e66c0195e3ed7fe30 is available and recommended to remediate the issue. No public exploit code or active exploitation has been reported to date, but the disclosure means attackers could develop exploits in the future.

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 could lead to unauthorized access to sensitive data, modification or deletion of files, and disruption of service availability. Since the vulnerability requires local access, the risk is higher in environments where multiple users have access to the same system or where attackers can gain initial foothold through other means (e.g., compromised credentials or insider threats). Organizations relying on this software for automated commit or deployment processes may face risks of supply chain compromise or unauthorized code changes. The medium severity rating reflects the limited attack vector but significant consequences if exploited. Failure to patch could allow attackers to escalate privileges or move laterally within a network, especially in development or CI/CD environments where this tool is used.

To mitigate CVE-2026-4198, organizations should immediately apply the official patch identified by commit f7d992c830c5f2ec5749852e66c0195e3ed7fe30 to upgrade mcp-server-auto-commit beyond version 1.0.0. Until patched, restrict local access to systems running this software to trusted users only and monitor for suspicious command execution activities. Implement strict access controls and auditing on developer and CI/CD environments where this tool is deployed. Consider isolating build and commit automation servers from general user environments to reduce the risk of local exploitation. Additionally, review and sanitize any inputs passed to the getGitChanges function or similar command execution contexts in custom forks or integrations. Employ endpoint detection and response (EDR) solutions to detect anomalous command executions indicative of exploitation attempts. Finally, maintain an inventory of affected software versions and ensure timely updates as part of vulnerability management processes.