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Vulnerability · Published Jun 23, 2026 · Assigned by redhat

CVE-2026-12891Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266/vvc vui parameter parser

Medium 4.3

In plain English

A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 67.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13gst-plugins-bad1.01.26.2-3+deb13u3DEBIAN-CVE-2026-12891
Debian:14gst-plugins-bad1.01.28.5-1DEBIAN-CVE-2026-12891
Ubuntu:25.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12891
Ubuntu:26.04:LTSgst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12891
Ubuntu:26.10gst-plugins-bad1.0no fix listedUBUNTU-CVE-2026-12891

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

References