A buffer overflow was found in the RAR code used by libclamunrar, which could result in arbitrary code execution when processing malicious RAR archives.
For Debian 10 buster, this problem has been fixed in version 0.103.10-0+deb10u1.
We recommend that you upgrade your libclamunrar packages.
For the detailed security status of libclamunrar please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libclamunrar
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