The cjpeg utility in libjpeg allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) or execute arbitrary code via a crafted file.
https://usn.ubuntu.com/3706-2/
https://usn.ubuntu.com/3706-1/
https://lists.debian.org/debian-lts-announce/2019/01/msg00015.html
https://bugzilla.redhat.com/show_bug.cgi?id=1319661