CVE-2026-58599 HEVC Video Extensions Remote Code Execution Vulnerability

High 7.8 Published 8 Sep 2026 Updated 14 Oct 2026

Heap-based buffer overflow in Microsoft HEVC Video Extensions allows local attackers to execute arbitrary code.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-58599?

CVE-2026-58599 is a high-severity memory corruption vulnerability in Microsoft HEVC Video Extensions, published on 8 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.

Weakness: CWE-122

Which versions are affected by CVE-2026-58599?

It affects 3 products.

Products include Microsoft Hevc Video Extensions, Microsoft Hevc Video Extensions for Licensed Applications, Microsoft Hevc Video Extensions From Device Manufacturer.

How do I fix CVE-2026-58599?

No fix has been published for CVE-2026-58599 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-58599 being exploited?

There is no known exploitation of CVE-2026-58599 in the wild and no public exploit code.

Sources

Also known as GHSA-722r-36gm-q2j8.