CVE-2026-12892 Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser
A 1-byte heap out-of-bounds read in GStreamer's H.264 parser allows attackers to crash applications or leak memory via malicious video 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-2026-12892?
CVE-2026-12892 is a medium-severity memory corruption vulnerability in Gstreamer Gstreamer, published on 23 Jun 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
A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.
Weakness: CWE-125
Which versions are affected by CVE-2026-12892?
It affects 2 products.
Products include Gstreamer Gstreamer, Redhat Enterprise Linux.
How do I fix CVE-2026-12892?
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-2026-12892 being exploited?
There is no known exploitation of CVE-2026-12892 in the wild and no public exploit code.
Other vulnerabilities in Gstreamer Gstreamer
- CVE-2026-3083 GStreamer rtpqdm2depay Out-Of-Bounds Write Remote Code Execution Vulnerability
- CVE-2026-3085 GStreamer rtpqdm2depay Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2023-37328 GStreamer PGS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2023-37329 GStreamer SRT File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2023-38103 GStreamer RealMedia File Parsing Integer Overflow Remote Code Execution Vulnerability
Sources
Also known as DEBIAN-CVE-2026-12892, ECHO-f069-e7ae-e4f6, GHSA-mc62-3gf7-rphg, UBUNTU-CVE-2026-12892.