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Fencer Intel
medium 4.3

CVE-2026-12891 json

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

published 4mo ago modified 4d ago also EUVD-2026-38606

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

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.

Patch / fix

  • gst-plugins-bad1.0 Debian 13 1.26.2-3+deb13u3
  • gst-plugins-bad1.0 Debian 14 1.28.5-1

debian advisories DEBIAN-CVE-2026-12891

  • gstreamer-plugins-bad SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.26.7-160000.3.1

suse advisories SUSE-SU-2026:22752-1SUSE-SU-2026:22817-1

  • gstreamer-plugins-bad openSUSE Leap 16.0 1.26.7-160000.3.1

opensuse advisories openSUSE-SU-2026:21370-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12891 updated cvss 4.3

gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow (OOB read) in H.266/VVC VUI parameter parser

  • Red Hat Enterprise Linux 8 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free 1.26.7-2.el10 Red Hat Enterprise Linux 9 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-libs, gstreamer1-plugins-bad-free 1.26.7-2.el10 Red Hat Enterprise Linux 10 gstreamer1-plugins-bad-free 1.26.7-2.el10
    affected: workaround, no fix available “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.