CVE-2026-3086 GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability

High 7.8 Published 13 Mar 2026 Updated 15 Jul 2026

Remote attackers can execute arbitrary code via a crafted H.266 video stream due to an out-of-bounds write in the GStreamer codec parser.

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: Available

What is CVE-2026-3086?

CVE-2026-3086 is a high-severity memory corruption vulnerability in Gstreamer Gstreamer, published on 13 Mar 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

GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the processing of APS units. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28911.

Weakness: CWE-787

Which versions are affected by CVE-2026-3086?

It affects 1 product.

Products include Gstreamer Gstreamer.

How do I fix CVE-2026-3086?

Apply the vendor's patch.

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

Is CVE-2026-3086 being exploited?

There is no known exploitation of CVE-2026-3086 in the wild and no public exploit code.

All Gstreamer Gstreamer vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-3086, GHSA-x6f2-qq5v-gx79, MINI-2623-g92r-q5q8, UBUNTU-CVE-2026-3086.