In ImageMagick 7.0.7-12 Q16, an infinite loop vulnerability was found in the function ReadPSDChannelZip in coders/psd.c, which allows attackers to cause a denial of service (CPU exhaustion) via a crafted psd image file.
https://usn.ubuntu.com/3681-1/
https://lists.debian.org/debian-lts-announce/2020/08/msg00030.html