CVE-2021-3498
GStreamer before 1.18.4 might cause heap corruption when parsing certain malformed Matroska files.
Date published : 2021-04-19
https://www.debian.org/security/2021/dsa-4900
http://packetstormsecurity.com/files/162952/Gstreamer-Matroska-Demuxing-Use-After-Free.html