In ImageMagick 7.0.6-1, a memory exhaustion vulnerability was found in the function ReadSUNImage in coders/sun.c, which allows attackers to cause a denial of service.
https://usn.ubuntu.com/3681-1/
https://lists.debian.org/debian-lts-announce/2020/09/msg00007.html
https://lists.debian.org/debian-lts-announce/2019/05/msg00015.html