A new upstream version of clamav has been released for Debian GNU/Linux 10 LTS to address critical issues.

DLA 3220-1: clamav new upstream version

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Debian LTS Advisory DLA-3220-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 04, 2022   https://wiki.debian.org/LTS
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Package : clamav
Version : 0.103.7+dfsg-0+deb10u1

ClamAV, an anti-virus utility for Unix, v0.103.7 is a critical patch
release with the following fixes:

* Fix logical signature "Intermediates" feature.
* Relax constraints on slightly malformed zip archives that contain
overlapping file entries.

For Debian 10 buster, this problem has been fixed in version
0.103.7+dfsg-0+deb10u1.

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