# CVE-2026-5056: gst-plugins-good1.0: GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE-2026-5056 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2026-5056, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-5056
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 4, 2026

## Description

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.  The specific flaw exists within the parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29392.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gst-plugins-good1.0 Debian 13.5 (trixie) | 1.26.2-1+deb13u1 | [DEBIAN-CVE-2026-5056](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5056.md) | May 15, 2026 |
| Linux | gst-plugins-good1.0 Debian 14 | 1.28.2-1 | [DEBIAN-CVE-2026-5056](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5056.md) | May 15, 2026 |
| Linux | gstreamer1-plugins-good RHEL 10 | 1.26.7-2.el10_2.2 | [RHSA-2026:49508](https://patchblox.com/security/data/fix/linux/rhsa-2026-49508.md) | Aug 3, 2026 |
| Linux | gstreamer1-plugins-good almalinux 10 | 1.26.7-2.el10_2.2 | [ALSA-2026:49508](https://patchblox.com/security/data/fix/linux/alsa-2026-49508.md) | Aug 3, 2026 |
| Linux | gstreamer1-plugins-good ol 10 | 0:1.26.7-2.el10_2.2 | [ELSA-2026-49508](https://patchblox.com/security/data/fix/linux/elsa-2026-49508.md) | Aug 3, 2026 |
| Linux | gstreamer1-plugins-good rocky 10 | 0:1.26.7-2.el10_2.2 | [RLSA-2026:49508](https://patchblox.com/security/data/fix/linux/rlsa-2026-49508.md) | Aug 4, 2026 |
| Linux | gstreamer1-plugins-good-gtk almalinux 10 | 1.26.7-2.el10_2.2 | [ALSA-2026:49508](https://patchblox.com/security/data/fix/linux/alsa-2026-49508.md) | Aug 3, 2026 |
| Linux | gstreamer1-plugins-good-gtk ol 10 | 0:1.26.7-2.el10_2.2 | [ELSA-2026-49508](https://patchblox.com/security/data/fix/linux/elsa-2026-49508.md) | Aug 3, 2026 |
| Linux | gstreamer1.0-gtk3 Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [gstreamer1.0-gtk3 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-gstreamer1.0-gtk3-1.26.5-1ubuntu2.2.md) | May 27, 2026 |
| Linux | gstreamer1.0-plugins-good Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [gstreamer1.0-plugins-good 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-gstreamer1.0-plugins-good-1.26.5-1ubuntu2.2.md) | May 27, 2026 |
| Linux | gstreamer1.0-pulseaudio Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [gstreamer1.0-pulseaudio 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-gstreamer1.0-pulseaudio-1.26.5-1ubuntu2.2.md) | May 27, 2026 |
| Linux | gstreamer1.0-qt5 Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [gstreamer1.0-qt5 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-gstreamer1.0-qt5-1.26.5-1ubuntu2.2.md) | May 27, 2026 |
| Linux | gstreamer1.0-qt6 Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [gstreamer1.0-qt6 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-gstreamer1.0-qt6-1.26.5-1ubuntu2.2.md) | May 27, 2026 |
| Linux | libgstreamer-plugins-good1.0-0 Ubuntu 25.10 (questing) | 1.26.5-1ubuntu2.2 | [libgstreamer-plugins-good1.0-0 1.26.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libgstreamer-plugins-good1.0-0-1.26.5-1ubuntu2.2.md) | May 27, 2026 |

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Data as of 2026-11-08T13:06:02Z 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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