Monday, October 31, 2022

Today we are publishing updated packages for ClamAV 0.103.7, 0.104.4, and 0.105.1.

Why we updated the installer packages

The ClamAV RPM, DEB, PKG, MSI and ZIP installer packages come with all library dependencies bundled. The updated installer packages resolve the following CVE's:

  • CVE-2022-37434 - A critical severity vulnerability in the zlib library.
  • CVE-2022-40303 - A high severity vulnerability in the libxml2 library. Note: As of writing, the details of this CVE are not published. However, you can find additional details on other sites.
  • CVE-2022-40304 - A high severity vulnerability in the libxml2 library. Note: As of writing, the details of this CVE are not published. However, you can find additional details on other sites.

Why we updated the 0.105.1 source package

Starting with ClamAV 0.105.1, some of the ClamAV project is written in Rust and depends on Rust libraries. To make it possible for our users to build ClamAV offline, we bundle in the Rust dependencies.

There are no CVEs present for the Rust libraries bundled in the original 0.105.1 package. However, there are several critical bugs in the JPEG and TIFF image processing libraries in the original 0.105.1 source package. The known issues were resolved in image-tiff version 0.7.4 and jpeg-decoder version 0.3.0. The clamav-0.105.1-2.tar.gz source package includes the updated libraries.

Linux/Unix package maintainers are encouraged to publish new revisions of their own packages for ClamAV 0.105.1 to get these fixes. Anyone who built ClamAV from the original clamav-0.105.1.tar.gz source package is encouraged to reinstall from the newer source package.

Where to find the updated packages

The new packages have a -2 suffix to indicate the package revision. For example, clamav-0.105.1-2.macos.universal.pkg is the updated package replacing clamav-0.105.1.macos.universal.pkg.

As always, you can get the updated packages from the Downloads page. The original packages have been hidden on the web page and replaced by the updated packages. If you need the originals, the URLs to download them still work.

What about the Docker images

The official ClamAV docker image has been updated to patch the zlib and libxml2 vulnerabilities. The following tags have been updated to point to the new images:

  • clamav/clamav:latest
  • clamav/clamav:latest_base
  • clamav/clamav:stable
  • clamav/clamav:stable_base
  • clamav/clamav:0.105
  • clamav/clamav:0.105_base
  • clamav/clamav:0.105.1
  • clamav/clamav:0.105.1_base

Be sure to use docker pull to get the latest version of the image. For example:

docker pull clamav/clamav:0.105_base

Tuesday, October 25, 2022

We are excited to announce the ClamAV 1.0.0 release candidate!

You may find the source code and installers for this release on:

Note: If you are looking for the source code on - there is an issue preventing the "Source" section from showing for release candidates. Until we fix this issue, you find it under the "Linux" section. 

Tip: If you are downloading the source from the GitHub release page, the package labeled "clamav-1.0.0-rc.tar.gz" does not require an internet connection to build.  All dependencies are included in this package.  But if you download the ZIP or TAR.GZ generated by GitHub, located at the very bottom, then an internet connection will be required during the build to download additional Rust dependencies.

For Docker users, there is no specific Docker tag for the release candidate, but you can use the clamav:unstable or clamav:unstable_base tags.

The release candidate phase is expected to last two to three weeks before we publish the stable release or a second release candidate. Please take this time to evaluate ClamAV 1.0.0.  

Please help us validate this release by providing feedback via the ClamAV mailing list or on our Discord.

ClamAV 1.0.0 includes the following improvements and changes.

Major changes

  • Support for decrypting read-only OLE2-based XLS files that are encrypted with the default "VelvetSweatshop" password. Use of the VelvetSweatshop password will now appear in the metadata JSON.

  • Overhauled the implementation of the all-match feature. The newer code is more reliable and easier to maintain.

    • This project fixed several known issues with signature detection in all- match mode:
      • Enabled embedded file-type-recognition-signatures to match when a malware signature also matched in a scan of the same layer.
      • Enabled bytecode signatures to run in all-match mode after a match has occurred.
      • Fixed an assortment of all-match edge case issues:
    • Added multiple test cases to verify correct all-match behavior.
    • GitHub pull request:
  • Added a new callback to the public API for inspecting file content during a scan at each layer of archive extraction.

    • The new callback function type is clcb_file_inspection defined in clamav.h.
    • The function cl_engine_set_clcb_file_inspection() may be used to enable the callback prior to performing a scan.
    • This new callback is to be considered unstable for the 1.0 release. We may alter this function in a subsequent feature version.
    • GitHub pull request:
  • Added a new function to the public API for unpacking CVD signature archives.

    • The new function is cl_cvdunpack(). The last parameter for the function may be set to verify if a CVD's signature is valid before unpacking the CVD content to the destination directory.
    • GitHub pull request:

Other improvements

  • Add checks to limit PDF object extraction recursion.

  • Increased the limit for memory allocations based on untrusted input and altered the warning message when the limit is exceeded so that it is more helpful and less dramatic.

  • Dramatically improved the build time of libclamav-Rust unit tests. The unit test build is included in the time limit for the test itself and was timing out on slower systems. The ClamAV Rust code modules now share the same build directory, which also reduces the amount of disk space used for the build.

  • Windows: The debugging symbol (PDB) files are now installed alongside the DLL

  • and LIB library files when built in "RelWithDebInfo" or "Debug" mode.

  • Relaxed the constraints on the check for overlapping ZIP file entries so as not to alert on slightly malformed, but non-malicious, Java (JAR) archives.

  • Increased the time limit in FreshClam before warning if the DNS entry is stale. In combination with changes to update the DNS entry more frequently, this should prevent false alarms of failures in the database publication system.

  • Docker: The C library header files are now included in the Docker image. Patch courtesy of GitHub user TerminalFi.

  • Show the BYTECODE_RUNTIME build options when using the ccmake GUI for CMake. Patch courtesy of Дилян Палаузов.

  • Added explicit minimum and maximum supported LLVM versions so that the build will fail if you try to build with the version that is too old or too new and will print a helpful message rather than simply failing to compile because of compatibility issues. Patch courtesy of Matt Jolly.

Bug fixes


Special thanks to the following people for code contributions and bug reports:

  • Ben Bodenmiller
  • Дилян Палаузов
  • Liam Jarvis
  • Matt Jolly
  • monkz
  • teoberi
  • TerminalFi