CVE-2026-39042

HIGH7.5

An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so

Published Jul 13, 2026

Modified 1 months ago

Details

An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so.

References

WEB

https://mikrotik.com/supportsec

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-39042

WEB

https://zakpatrik.cz/blog/finding-an-integer-overflow-in-mikrotik-routeros-core-ipc-library

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector