{"id":"CVE-2026-89028","title":"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 ha…","summary":"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 ha…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-122","CWE-191"],"vendor":"MikroTik","product":"RouterOS","affected":["RouterOS <= 6.49.18","RouterOS >= 7.0.0 <= 7.11.2"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T20:18:52.157","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89028","references":[{"url":"https://forum.mikrotik.com/t/7-24-stable-is-released/272381","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/mikrotik-routeros-heap-corruption-via-smb1-sessionsetupandx","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T19:16:36.762410Z"},"ingestedAt":"2026-09-16T13:56:12.618Z","epss":0.00557,"epssPercentile":0.45011,"slug":"CVE-2026-89028","body":"## Overview\n\nMikroTik 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}