A gst-libav1.0 security update has been released for Debian GNU/Linux 9 LTS to address multiple vulnerabilities.

DLA 2644-1: gst-libav1.0 security update

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Debian LTS Advisory DLA-2644-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
April 27, 2021   https://wiki.debian.org/LTS
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Package : gst-libav1.0
Version : 1.10.4-1+deb9u1
CVE ID : not yet available

Multiple vulnerabilities were discovered in plugins for the GStreamer
media framework, which may result in denial of service or potentially
the execution of arbitrary code if a malformed media file is opened.

For Debian 9 stretch, this problem has been fixed in version
1.10.4-1+deb9u1.

We recommend that you upgrade your gst-libav1.0 packages.

For the detailed security status of gst-libav1.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/gst-libav1.0

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS