A clamav security update has been released for Debian GNU/Linux 9 LTS to update the installation to version 0.103.

DLA 2875-1: clamav security update

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Debian LTS Advisory DLA-2875-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
January 10, 2022   https://wiki.debian.org/LTS
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Package : clamav
Version : 0.103.4+dfsg-0+deb9u1

Version 0.102 of ClamAV, an anti-virus toolkit, is end-of-life. ClamAV
has been updated to version 0.103 to be able to receive virus signature
updates.

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

We recommend that you upgrade your clamav packages.

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

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