A vlc security update has been released for Debian GNU/Linux 9 LTS to address multiple vulnerabilities.

DLA 3050-1: vlc security update

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Debian LTS Advisory DLA-3050-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
June 10, 2022   https://wiki.debian.org/LTS
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Package : vlc
Version : 3.0.12-0+deb9u1
CVE ID : CVE-2020-26664
Debian Bug : 979676

Multiple vulnerabilities were discovered in the VLC media player,
which could result in the execution of arbitrary code or denial of
service if a malformed media file is opened.

For Debian 9 stretch, this problem has been fixed in version
3.0.12-0+deb9u1.

We recommend that you upgrade your vlc packages.

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

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