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Fencer Vulns
medium 4.4

CVE-2026-12892 json

Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser

published 2026-06-23 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-38607

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

  • gst-plugins-bad1.0 Debian 12 1.22.0-4+deb12u8
  • 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-2026-12892

  • gstreamer-plugins-bad SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.20.1-150400.3.29.1
  • gstreamer-plugins-bad SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 1.22.0-150500.3.34.1
  • gstreamer-plugins-bad SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.26.7-160000.3.1
  • gstreamer-plugins-bad SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Package Hub 15 SP7 +2 more 1.24.0-150600.4.9.1
  • gstreamer-plugins-bad SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.8.3-18.21.1

suse advisories SUSE-SU-2026:3299-1SUSE-SU-2026:3133-1SUSE-SU-2026:3125-1SUSE-SU-2026:22752-1SUSE-SU-2026:22817-1SUSE-SU-2026:3058-1

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

opensuse advisories openSUSE-SU-2026:21370-1

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-2026-12892 updated cvss 4.4

gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser

  • Red Hat Enterprise Linux 6 gstreamer-plugins-bad-free, gstreamer-plugins-bad-free-extras Red Hat Enterprise Linux 7 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-gtk, gstreamer1-plugins-bad-free 1.26.7-2.el10 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
4 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns 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.