What is CVE-2026-108400?

CVE-2026-108400 is a high-severity vulnerability in Microsoft Hevc Video Extensions, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2026-10-13.

How severe is CVE-2026-108400?

High severity. CVSS v3 base score is 8.8 out of 10.

Integer overflow in Microsoft Hevc Video Extensions

CVE-2026-108400

Integer overflow or wraparound in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.

Vulnerability class: Integer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

HEVC Video Extensions Remote Code Execution Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-108400?: CVE-2026-108400 is a high-severity vulnerability in Microsoft Hevc Video Extensions, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2026-10-13.
How severe is CVE-2026-108400?: High severity. CVSS v3 base score is 8.8 out of 10.