libarchive 3.3.2 allows remote attackers to cause a denial of service (xml_data heap-based buffer over-read and application crash) via a crafted xar archive, related to the mishandling of empty strings in the atol8 function in archive_read_support_format_xar.c.
https://www.debian.org/security/2018/dsa-4360
https://usn.ubuntu.com/3736-1/
https://security.gentoo.org/glsa/201908-11
https://lists.debian.org/debian-lts-announce/2018/11/msg00037.html
https://github.com/libarchive/libarchive/commit/fa7438a0ff4033e4741c807394a9af6207940d71