gstreamer vulnerabilities (Alpine)

2 vulnerabilities.

• gstreamer Alpine GStreamer before 1.18.4 might cause heap corruption when parsing certain malformed Matroska files. CVE-2021-3498 Fix available 7.8 HighApril 19, 2021
• gstreamer Alpine GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing... CVE-2021-3497 Fix available 7.8 HighApril 19, 2021