This vulnerability (CVE-2026-41113) affects sagredo qmail prior to version 2026.04.07. It is classified as CWE-78, OS Command Injection, caused by improper sanitization of inputs passed to the popen function in the notlshosts_auto routine of qmail-remote.c. This flaw allows remote attackers to execute arbitrary code through the tls_quit mechanism. The CVSS 3.1 base score is 8.1, reflecting network attack vector, high complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. No patch or official fix has been documented yet.

Successful exploitation can lead to remote code execution on affected systems, compromising confidentiality, integrity, and availability. This could allow attackers to execute arbitrary commands with the privileges of the qmail process remotely without authentication. No known exploits have been reported in the wild so far.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider restricting network access to the affected service and monitor for unusual activity related to qmail. Avoid exposing vulnerable versions to untrusted networks. Do not rely on generic mitigations unless specifically recommended by the vendor.