Security Advisory 2021-0002
||Use-after-free in matroska demuxing
||GStreamer gst-plugins-good 1.x <= 1.18.3, 0.10.x > 0.10.8
GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing certain malformed Matroska files.
It might be possible for a malicious third party to trigger a crash in the application, but possibly also an arbitrary code execution with the privileges of the target user.
The gst-plugins-good 1.18.4 release addresses the issue. People using older branches of GStreamer should apply the patch and recompile.
The GStreamer project
GStreamer 1.18.4 release