CVE-2026-108400 HEVC Video Extensions Remote Code Execution Vulnerability
An integer overflow in the Windows HEVC codec allows remote attackers to execute arbitrary code via malicious media files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-108400?
CVE-2026-108400 is a high-severity vulnerability in Microsoft HEVC Video Extensions, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Integer overflow or wraparound in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.
Weakness: CWE-190
Which versions are affected by CVE-2026-108400?
How do I fix CVE-2026-108400?
No fix has been published for CVE-2026-108400 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-108400 being exploited?
There is no known exploitation of CVE-2026-108400 in the wild and no public exploit code.
Sources
Also known as GHSA-5m3f-9xq8-mc4f.