CVE-2021-26902 HEVC Video Extensions Remote Code Execution Vulnerability

High 7.8 Published 11 Mar 2021 Updated 19 Aug 2026

An attacker can execute arbitrary code by exploiting a vulnerability in the HEVC Video Extensions component.

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-2021-26902?

CVE-2021-26902 is a high-severity code injection vulnerability in Microsoft HEVC Video Extensions, published on 11 Mar 2021. 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

HEVC Video Extensions Remote Code Execution Vulnerability

Which versions are affected by CVE-2021-26902?

It affects 1 product.

Products include Microsoft High Efficiency Video Coding.

How do I fix CVE-2021-26902?

No fix has been published for CVE-2021-26902 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-26902 being exploited?

There is no known exploitation of CVE-2021-26902 in the wild and no public exploit code.

Sources

Also known as GHSA-8wmr-chfq-6mfm.