GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing certain malformed Matroska files.
Created mingw-gstreamer-plugins-good tracking bugs for this issue:
Affects: fedora-all [bug 1945340]
This is a use-after-free in gstreamer Matroska plugin. An attacker could a malicious .mkv file and cause application crash or even arbitrary code execution with permissions of the user running the said application. However code execution seems difficult, because the most modern compilers and glibc have protections against use-after-free
Created gstreamer1-plugins-good tracking bugs for this issue:
Affects: fedora-all [bug 1948948]
Created mingw-gstreamer1-plugins-good tracking bugs for this issue:
Affects: fedora-all [bug 1948947]