TI-2026-21268 CVE-2026-26312Stalwart Mail Server has Out-of-Memory Denial of Service via Malformed Nested MIME MessagesPriority LOW 29Stalwart is a mail and collaboration server.CVSS 3.1MEDIUM 6.5· Network · Low privileges · No interaction · EPSS 0.0041 · Published 2026-02-19 · Fixed in 0.15.5 CWE-770