{"id":"CVE-2026-89028","published":"2026-09-16T14:17:12.887","lastModified":"2026-09-17T20:18:52.157","description":"MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-122","CWE-191"],"vendors":[],"products":[],"references":[{"url":"https://forum.mikrotik.com/t/7-24-stable-is-released/272381","tags":[]},{"url":"https://www.vulncheck.com/advisories/mikrotik-routeros-heap-corruption-via-smb1-sessionsetupandx","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}