CVE-2026-12891 Information disclosure in Red Hat Enterprise Linux 10

What is CVE-2026-12891?

CVE-2026-12891 is a medium-severity vulnerability in Gstreamer Gstreamer, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.

Weakness: CWE-125

Which versions are affected by CVE-2026-12891?

It affects 2 products.

Products include Gstreamer Gstreamer, Redhat Enterprise Linux.

How do I fix CVE-2026-12891?

Apply the vendor's patch.

Is CVE-2026-12891 being exploited?

There is no known exploitation of CVE-2026-12891 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 High 8.8
• CVE-2026-3085 GStreamer rtpqdm2depay Heap-based Buffer Overflow Remote Code Execution Vulnerability High 8.8
• CVE-2023-37328 GStreamer PGS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability High 8.8
• CVE-2023-37329 GStreamer SRT File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability High 8.8
• CVE-2023-38103 GStreamer RealMedia File Parsing Integer Overflow Remote Code Execution Vulnerability High 8.8

All Gstreamer Gstreamer vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-12891, ECHO-fe2f-08ad-190b, GHSA-9j3r-2vv4-g5x8, UBUNTU-CVE-2026-12891.