What is CVE-2026-39042?

CVE-2026-39042 is a high-severity vulnerability in N/a, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-07-13.

How severe is CVE-2026-39042?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in N/a

CVE-2026-39042

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.

Vulnerability class: Integer Overflow

EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-39042?: CVE-2026-39042 is a high-severity vulnerability in N/a, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-07-13.
How severe is CVE-2026-39042?: High severity. CVSS v3 base score is 7.5 out of 10.