CVE-2026-2921 GStreamer RIFF Palette Integer Overflow Remote Code Execution Vulnerability

High 7.8 Published 13 Mar 2026 Updated 21 Jul 2026

Remote attackers can execute arbitrary code via integer overflow in GStreamer's RIFF palette handling when processing malicious AVI 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-2026-2921?

CVE-2026-2921 is a high-severity 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 RIFF Palette Integer 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 handling of palette data in AVI files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28854.

Weakness: CWE-190

Which versions are affected by CVE-2026-2921?

It affects 1 product.

Products include Gstreamer Gstreamer.

How do I fix CVE-2026-2921?

Apply the vendor's patch.

Is CVE-2026-2921 being exploited?

There is no known exploitation of CVE-2026-2921 in the wild and no public exploit code.

All Gstreamer Gstreamer vulnerabilities

Sources

Also known as AZL-79974, BELL-CVE-2026-2921, CLSA-2026-1776334207, CLSA-2026-1776778859, CLSA-2026-1785308941, DEBIAN-CVE-2026-2921 and 11 more.