Multiple security issues were found in libarchive, a multi-format archive and compression library: Processing malformed RAR archives could result in denial of service or the execution of arbitrary code and malformed WARC, LHarc, ISO, Xar or CAB archives could result in denial of service.
For the stable distribution (stretch), these problems have been fixed in version 3.2.2-2+deb9u1.
We recommend that you upgrade your libarchive packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/