Ubuntu USN-8896-1: code execution and denial-of-service flaws in GStreamer Ugly Plugins

What happened and what to do

The Ubuntu Security advisory (USN-8896-1) describes flaws in how the GStreamer Ugly Plugins handle malformed RealMedia and ASF files. According to the advisory, if a user is induced to open a file crafted for this purpose, an attacker could possibly execute arbitrary code, cause denial of service or expose sensitive information. The identifiers cited are CVE-2023-38103, CVE-2023-38104, CVE-2026-2920, CVE-2026-2922, CVE-2026-53703, CVE-2026-53704 and CVE-2026-19389. CVE-2023-38103 and CVE-2023-38104 affected Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS and 22.04 LTS, and CVE-2026-2920 and CVE-2026-2922 also affected Ubuntu 24.04 LTS.

For a company, this case calls for operations engineering work rather than an AI solution. In practice: inventory every host and container image with the gstreamer1.0-plugins-ugly package installed, apply the vendor updates and measure the time to remediation; isolate conversion or indexing of media received from third parties in unprivileged workers without access to the internal network; and monitor crashes and restarts of these processes to detect files that bring the service down or signs of exploitation. A dashboard showing patch status per asset helps prove coverage.

How the consultancy can help

Diagnosis of exposure to this advisory: inventory of hosts, images and media pipelines that use the GStreamer Ugly Plugins, prioritised by Ubuntu release and by the origin of the files processed. Then scoped implementation of inventory collection, a patch status dashboard and isolation of media processing, with operation and follow-up.

Next step

If your company processes media files received from third parties or runs Ubuntu servers with these packages, send a short description of your environment and your case. Wendelmaques will reply with an initial diagnosis and a scoped proposal.