CVE-2026-2920 GStreamer ASF Demuxer Heap-based Buffer Overflow Remote Code Execution Vulnerability

High 7.8 Published 13 Mar 2026 Updated 21 Jul 2026

Remote attackers can execute arbitrary code via a heap-based buffer overflow in the GStreamer ASF demuxer when processing malicious files.

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-2026-2920?

CVE-2026-2920 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 ASF Demuxer Heap-based Buffer Overflow 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 stream headers within ASF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28843.

Weakness: CWE-120, CWE-122

Which versions are affected by CVE-2026-2920?

It affects 1 product.

Products include Gstreamer Gstreamer.

How do I fix CVE-2026-2920?

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-2026-2920 being exploited?

There is no known exploitation of CVE-2026-2920 in the wild and no public exploit code.

All Gstreamer Gstreamer vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-2920, GHSA-wj6x-vgpf-cpm6, MINI-6wg8-hfg8-p23w, UBUNTU-CVE-2026-2920.