gstreamer1-plugins-ugly-free: A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package
CVE-2026-53704 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-53704, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gst-plugins-ugly1.0 · Debian 14 | 1.28.4-1 | DEBIAN-CVE-2026-53704 | Jun 24, 2026 |
| gstreamer1-plugins-ugly-free · RHEL 10 | 1.24.11-1.el10_0.2 | RHSA-2026:50688 | Jul 9, 2026 |
| gstreamer1-plugins-ugly-free · RHEL 9 | 0:1.22.12-6.el9_8.1 | RHSA-2026:36674 | Jul 9, 2026 |
| gstreamer1-plugins-ugly-free · almalinux 10 | 1.26.7-2.el10_2.1 | ALSA-2026:36673 | Jul 8, 2026 |
| gstreamer1-plugins-ugly-free · almalinux 9 | 1.22.12-6.el9_8.1 | ALSA-2026:36674 | Jul 8, 2026 |
| gstreamer1-plugins-ugly-free · ol 9 | 0:1.22.12-6.el9_8.1 | ELSA-2026-36674 | Jul 8, 2026 |
| gstreamer1-plugins-ugly-free · rocky 9 | 0:1.22.12-6.el9_8.1 | RLSA-2026:36674 | Jul 10, 2026 |
| gstreamer1.0-plugins-ugly · Ubuntu 18.04.6 LTS (bionic) | 1.14.5-0ubuntu1~18.04.1+esm1 | gstreamer1.0-plugins-ugly 1.14.5-0ubuntu1~18.04.1+esm1 | Aug 9, 2026 |
| gstreamer1.0-plugins-ugly · Ubuntu 20.04 LTS (focal) | 1.16.2-2ubuntu0.1~esm1 | gstreamer1.0-plugins-ugly 1.16.2-2ubuntu0.1~esm1 | Aug 9, 2026 |
| gstreamer1.0-plugins-ugly · Ubuntu 22.04.1 LTS (jammy) | 1.20.1-1ubuntu0.1~esm1 | gstreamer1.0-plugins-ugly 1.20.1-1ubuntu0.1~esm1 | Aug 9, 2026 |
| gstreamer1.0-plugins-ugly · Ubuntu 24.04.5 LTS (noble) | 1.24.1-1ubuntu0.1~esm1 | gstreamer1.0-plugins-ugly 1.24.1-1ubuntu0.1~esm1 | Aug 9, 2026 |
| gstreamer1.0-plugins-ugly · Ubuntu 26.04.1 LTS (resolute) | 1.28.2-1ubuntu0.1~esm1 | gstreamer1.0-plugins-ugly 1.28.2-1ubuntu0.1~esm1 | Aug 9, 2026 |
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