zutils version prior to version 1.8-pre2 contains a Buffer Overflow vulnerability in zcat that can result in Potential denial of service or arbitrary code execution. This attack appear to be exploitable via the victim openning a crafted compressed file. This vulnerability appears to have been fixed in 1.8-pre2.
https://lists.nongnu.org/archive/html/zutils-bug/2018-08/msg00000.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00016.html