# CVE-2026-12891: gst-plugins-bad1.0: A flaw was found in the GStreamer gst-plugins-bad package

CVE-2026-12891 is fixed in 2 products on 1 platform, first by OPENSUSE-SU-2026:21370-1, released July 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-12891
- Priority: Routine
- CVSS: 4.3 (medium)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 23, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gst-plugins-bad1.0 Debian 13.5 (trixie) | 1.26.2-3+deb13u3 | [DEBIAN-CVE-2026-12891](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12891.md) | Jul 22, 2026 |
| Linux | gst-plugins-bad1.0 Debian 14 | 1.28.5-1 | [DEBIAN-CVE-2026-12891](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12891.md) | Jul 22, 2026 |
| Linux | gstreamer-plugins-bad opensuse-leap 16.0 | 1.26.7-160000.3.1 | [OPENSUSE-SU-2026:21370-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21370-1.md) | Jul 18, 2026 |
| Linux | gstreamer-plugins-bad sles 16.0 | 1.26.7-160000.3.1 | [SUSE-SU-2026:22817-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22817-1.md) | Jul 18, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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