Major changes:
Added support for extracting Universal Disk Format (UDF) partitions.
Specifically, this version adds support for the Beginning Extended Area Descriptor (BEA01) type of UDF files.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/941 Added an option to customize the size of ClamAV's clean file cache.
Increasing the size of the clean file cache may improve scan performance but will require more RAM. The cache size value should be a square number or will be rounded up to the nearest square number.
The cache size option for clamd and clamscan is --cache-size. Alternatively, you can customize the cache size for ClamD by setting CacheSize in clamd.conf.
Patch courtesy of Craig Andrews.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/882 Introduced a SystemD timer for running Freshclam updates, without sending Freshclam into the background. This takes the "burden of timing the updates" from Freshclam and puts it onto SystemD. The timer can be activated, audited, and the logs inspected:
sudo systemctl enable --now clamav-freshclam-once.timer
sudo systemctl list-timers
sudo systemctl status clamav-freshclam-once.timer
sudo systemctl status clamav-freshclam-once.service
journalctl -u clamav-freshclam-once.service
If you want a different update interval you can edit the timer unit file:
sudo systemctl edit clamav-freshclam-once.timer
Patch courtesy of Nils Werner.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/962 Raised the MaxScanSize limit so the total amount of data scanned when scanning a file or archive may exceed 4 gigabytes.
Introduced the ability to suffix the MaxScanSize and other config file size options with a "G" or "g" for the number of gigabytes. For example, for ClamD you may now specify MaxScanSize 10G in clamd.conf. And for ClamScan, you may now specify --max-scansize=10g.
The MaxFileSize is still limited internally in ClamAV to 2 gigabytes. Any file, or embedded file, larger than 2GB will be skipped. You may use clamscan --alert-exceeds-max, or the clamd.conf option AlertExceedsMax yes to tell if a scan is not completed because of the scan limits.
Patch courtesy of matthias-fratz-bsz.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/945 Added ability for Freshclam to use a client certificate PEM file and a private key PEM file for authentication to a private mirror by setting the following environment variables:
FRESHCLAM_CLIENT_CERT: May be set to the path of a file (PEM) containing the client certificate.
FRESHCLAM_CLIENT_KEY: May be set to the path of a file (PEM) containing the client private key.
FRESHCLAM_CLIENT_KEY_PASSWD: May be set to a password for the client key PEM file, if it is password protected.
Patch courtesy of jedrzej.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/955 Other improvements:
Fix an issue extracting files from ISO9660 partitions where the files are listed in the plain ISO tree and there also exists an empty Joliet tree.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/938 CMake build system improvement to support compiling with OpenSSL 3.x on macOS with the Xcode toolchain.
The official ClamAV installers and packages are now built with OpenSSL 3.1.1 or newer.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/970 The suggested path for the clamd.pid and clamd.sock file in the sample configs have been updated to reflect the recommended locations for these files in the Docker images. These are:
/run/clamav/clamd.pid
/run/clamav/clamd.sock
For consistency, it now specifies clamd.sock instead of clamd.socket.
Patch courtesy of computersalat.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/931 Bug fixes:
Fixed an issue where ClamAV does not abort the signature load process after partially loading an invalid signature. The bug would later cause a crash when scanning certain files.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/934 Fixed a possible buffer over-read bug when unpacking PE files.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/927 Removed a warning message showing the HTTP response codes during the Freshclam database update process.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/935 Added missing command line options to the ClamD and ClamAV-Milter --help message and manpages.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/936 ClamOnAcc: Fixed error message when using --wait without --ping option. Patch courtesy of R?zvan Cojocaru.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/984 Fixed an assortment of code quality issues identified by Coverity:
GitHub pull requests:
https://github.com/Cisco-Talos/clamav/pull/989 https://github.com/Cisco-Talos/clamav/pull/998 Windows: Fixed a build issue with the CMake-Rust integration regarding detecting native static libraries that caused builds to fail with Rust version 1.70 and newer.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/992 Fixed a bounds check issue in the PDF parser that may result in a 1-byte buffer over read but does not cause a crash.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/988 Upgraded the bundled UnRAR library (libclamunrar) to version 6.2.10.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/1008 Fixed a compatibility issue with libjson-c version 0.17.
GitHub pull request:
https://github.com/Cisco-Talos/clamav/pull/1002 
