CVE-2026-56719

MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.

• https://forum.mikrotik.com/t/7-24-stable-is-released/272381
• https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx