Public bug reported:

lsb_release -rd
Description:    Ubuntu 18.04.3 LTS
Release:        18.04

apt-cache policy clamav
clamav:
  Installed: 0.100.3+dfsg-0ubuntu0.18.04.1
  Candidate: 0.100.3+dfsg-0ubuntu0.18.04.1

The current version of ClamAV for 18.04.3 LTS is 0.100.3+dfsg-
1ubuntu0.18.04.1. The current stable version of ClamAV is 0.101.4. There
have been patches released that fix security related bugs as shown
below:

CVE-2019-12900  BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an 
out-of-bounds write when there are many selectors. 
ClamAV 0.101.4 is a security patch release that addresses the following issues.
 An out of bounds write was possible within ClamAV's NSIS bzip2 library when 
attempting decompression in cases where the number of selectors exceeded the 
max limit set by the library (CVE-2019-12900). The issue has been resolved by 
respecting that limit.

CVE-2019-1798   A vulnerability in the Portable Executable (PE) file
scanning functionality of Clam AntiVirus (ClamAV) Software versions
0.101.1 and prior could allow an unauthenticated, remote attacker to
cause a denial of service condition on an affected device. The
vulnerability is due to a lack of proper input and validation checking
mechanisms for PE files sent an affected device. An attacker could
exploit this vulnerability by sending malformed PE files to the device
running an affected version ClamAV Software. An exploit could allow the
attacker to cause an out-of-bounds read condition, resulting in a crash
that could result in a denial of service condition on an affected
device.

Please see bug report
https://bugs.launchpad.net/ubuntu/+source/clamav/+bug/1822503 for a
listing of other CVEs that apply to versions up to 0.101.2

Request that ClamAV be updated to the latest version 0.101.4

** Affects: clamav (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1841281

Title:
  ClamAV needs updated to reflect security fixes

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