In GraphicsMagick 1.4 snapshot-20190322 Q8, there is a memory leak in the function ReadMPCImage of coders/mpc.c, which allows attackers to cause a denial of service via a crafted image file.
hg.graphicsmagick.org/hg/GraphicsMagick/rev/a348d9661019
lists.opensuse.org/opensuse-security-announce/2019-04/msg00093.html
lists.opensuse.org/opensuse-security-announce/2019-04/msg00107.html
lists.debian.org/debian-lts-announce/2019/04/msg00015.html
sourceforge.net/p/graphicsmagick/bugs/601/
usn.ubuntu.com/4207-1/
www.debian.org/security/2020/dsa-4640