GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing certain malformed Matroska files.Referenceshttps://bugzilla.redhat.com/show_bug.cgi?id=1945339https://gstreamer.freedesktop.org/security/sa-2021-0002.htmlhttps://www.debian.org/security/2021/dsa-4900https://lists.debian.org/debian-lts-announce/2021/04/msg00027.htmlhttps://security.gentoo.org/glsa/202208-31
