The most package in Debian wheezy before 5.0.0a-2.2, in Debian jessie before 5.0.0a-2.3+deb8u1, and in Debian unstable before 5.0.0a-3 allows remote attackers to execute arbitrary commands via shell metacharacters in the name of an LZMA-compressed file.
https://lists.debian.org/debian-lts-announce/2016/12/msg00020.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848132