In GraphicsMagick 1.4 snapshot-20190322 Q8, there is a heap-based buffer over-read in the function ReadXWDImage of coders/xwd.c, which allows attackers to cause a denial of service or information disclosure via a crafted image file.
https://www.debian.org/security/2020/dsa-4640
https://usn.ubuntu.com/4207-1/
https://sourceforge.net/p/graphicsmagick/bugs/597/
https://lists.debian.org/debian-lts-announce/2019/04/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00055.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00021.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00107.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00093.html
http://hg.graphicsmagick.org/hg/GraphicsMagick/rev/7cff2b1792de