# CVE-2026-39043: gstreamer1.0-gtk3: Heap buffer overflow in Matroska demuxer

CVE-2026-39043 is fixed in 12 products on 1 platform, first by gstreamer1.0-gtk3 1.20.3-0ubuntu1.7, released June 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-39043
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 16, 2026

## Description

Heap buffer overflow in Matroska demuxer

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gst-plugins-good1.0 Debian 12.15 (bookworm) | 1.22.0-5+deb12u4 | [DEBIAN-CVE-2026-39043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-39043.md) | Jun 24, 2026 |
| Linux | gst-plugins-good1.0 Debian 13.5 (trixie) | 1.26.2-1+deb13u2 | [DEBIAN-CVE-2026-39043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-39043.md) | Jun 24, 2026 |
| Linux | gst-plugins-good1.0 Debian 14 | 1.28.2-1 | [DEBIAN-CVE-2026-39043](https://patchblox.com/security/data/fix/linux/debian-cve-2026-39043.md) | Jun 24, 2026 |
| Linux | gstreamer1-plugins-good amzn 2023 | 1.24.10-1.amzn2023.0.7 | [ALAS2023-2026-1926](https://patchblox.com/security/data/fix/linux/alas2023-2026-1926.md) | Jul 6, 2026 |
| Linux | gstreamer1-plugins-good-debuginfo amzn 2023 | 1.24.10-1.amzn2023.0.7 | [ALAS2023-2026-1926](https://patchblox.com/security/data/fix/linux/alas2023-2026-1926.md) | Jul 6, 2026 |
| Linux | gstreamer1-plugins-good-debugsource amzn 2023 | 1.24.10-1.amzn2023.0.7 | [ALAS2023-2026-1926](https://patchblox.com/security/data/fix/linux/alas2023-2026-1926.md) | Jul 6, 2026 |
| Linux | gstreamer1-plugins-good-gtk amzn 2023 | 1.24.10-1.amzn2023.0.7 | [ALAS2023-2026-1926](https://patchblox.com/security/data/fix/linux/alas2023-2026-1926.md) | Jul 6, 2026 |
| Linux | gstreamer1-plugins-good-gtk-debuginfo amzn 2023 | 1.24.10-1.amzn2023.0.7 | [ALAS2023-2026-1926](https://patchblox.com/security/data/fix/linux/alas2023-2026-1926.md) | Jul 6, 2026 |
| Linux | gstreamer1.0-gtk3 Ubuntu 22.04.1 LTS (jammy) | 1.20.3-0ubuntu1.7 | [gstreamer1.0-gtk3 1.20.3-0ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gstreamer1.0-gtk3-1.20.3-0ubuntu1.7.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-gtk3 Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [gstreamer1.0-gtk3 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gstreamer1.0-gtk3-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-plugins-good Ubuntu 22.04.1 LTS (jammy) | 1.20.3-0ubuntu1.7 | [gstreamer1.0-plugins-good 1.20.3-0ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gstreamer1.0-plugins-good-1.20.3-0ubuntu1.7.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-plugins-good Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [gstreamer1.0-plugins-good 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gstreamer1.0-plugins-good-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-pulseaudio Ubuntu 22.04.1 LTS (jammy) | 1.20.3-0ubuntu1.7 | [gstreamer1.0-pulseaudio 1.20.3-0ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gstreamer1.0-pulseaudio-1.20.3-0ubuntu1.7.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-pulseaudio Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [gstreamer1.0-pulseaudio 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gstreamer1.0-pulseaudio-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-qt5 Ubuntu 22.04.1 LTS (jammy) | 1.20.3-0ubuntu1.7 | [gstreamer1.0-qt5 1.20.3-0ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gstreamer1.0-qt5-1.20.3-0ubuntu1.7.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-qt5 Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [gstreamer1.0-qt5 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gstreamer1.0-qt5-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |
| Linux | gstreamer1.0-qt6 Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [gstreamer1.0-qt6 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gstreamer1.0-qt6-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |
| Linux | libgstreamer-plugins-good1.0-0 Ubuntu 22.04.1 LTS (jammy) | 1.20.3-0ubuntu1.7 | [libgstreamer-plugins-good1.0-0 1.20.3-0ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgstreamer-plugins-good1.0-0-1.20.3-0ubuntu1.7.md) | Jun 16, 2026 |
| Linux | libgstreamer-plugins-good1.0-0 Ubuntu 24.04.5 LTS (noble) | 1.24.2-1ubuntu1.5 | [libgstreamer-plugins-good1.0-0 1.24.2-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgstreamer-plugins-good1.0-0-1.24.2-1ubuntu1.5.md) | Jun 16, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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