CVE-2026-119843

A flaw was found in GStreamer's gst-plugins-good package. The FLV media demuxer does not properly validate buffer sizes and data availability when processing enhanced audio and video tags in malformed or truncated FLV streams. A remote attacker could exploit this vulnerability by providing a specially crafted FLV media file that, when opened or streamed by a GStreamer-based application, triggers an assertion failure or a process crash, leading to denial of service.

This vulnerability is rated Moderate severity because a crafted FLV stream can crash the application; user interaction is required and there is no confidentiality or integrity impact. Enhanced RTMP v2 FLV parsing was introduced in upstream gst-plugins-good 1.28.x and fixed in 1.28.2. RHEL and RHIVOS ship gstreamer1-plugins-good below 1.28.0 and do not include the affected code. Fedora 44/rawhide ship 1.28.8 (fixed); Fedora 43 ships 1.26.x (not affected).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.