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CVE-2026-41113 is a remote code execution vulnerability in the sagredo-dev/qmail fork, affecting versions before 2026.04.07, specifically reported as v2024.10.26 through v2026.04.02. The flaw is in qmail-remote.c, in the TLS error handler tls_quit(), within the notlshosts_auto logic added in October 2024. When TLS delivery fails, the code constructs a shell command using sprintf() that includes the remote MX hostname and executes it via popen(). The hostname value, partner_fqdn, is attacker-controlled through DNS MX data. Although the implementation wraps the hostname in single quotes, this is insufficient because DNS labels can contain bytes that survive glibc dn_expand() decoding, including single quotes and shell metacharacters. A malicious MX hostname can therefore break out of the quoted context and inject arbitrary shell commands. Successful exploitation occurs when the target qmail server attempts delivery to an attacker-controlled domain and a TLS failure triggers tls_quit().
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A remote code execution vulnerability in sagredo qmail before version 2026.04.07 caused by use of popen in notlshosts_auto within qmail-remote.c.
A remote code execution vulnerability in sagredo's qmail fork caused by shell command injection in the notlshosts_auto feature. An attacker can control the remote hostname via DNS MX records, trigger a TLS failure during mail delivery, and cause qmail to execute attacker-controlled shell syntax via popen().
A command injection vulnerability in qmail related to processing attacker-controlled MX/DNS data that is passed into popen(), enabling shell command execution.
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