---
id: CVE-2026-12891
title: >-
  Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow
  (oob read) in h.266/vvc vui parameter parser
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
  mem…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-125
vendor: Red Hat
product: gstreamer1-plugins-bad-free
affected:
  - gstreamer1-plugins-bad-free (all versions)
  - gstreamer1-plugins-bad-free (all versions)
  - gstreamer1-plugins-bad-free (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-24T13:06:59.873615Z'
published: '2026-06-23'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T17:23:04.482Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-12891'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-12891'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2491318'
    label: RHBZ#2491318
  - url: 'https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5109'
tags:
  - cve.org
epss: 0.00387
epssPercentile: 0.3003
ingestedAt: '2026-09-11T11:32:42.886Z'
---

## Overview

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

- `gstreamer1-plugins-bad-free (all versions)`
- `gstreamer1-plugins-bad-free (all versions)`
- `gstreamer1-plugins-bad-free (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.