In GraphicsMagick 1.4 snapshot-20190403 Q8, there is a use-after-free in ThrowException and ThrowLoggedException of magick/error.c.
https://www.debian.org/security/2020/dsa-4640
https://sourceforge.net/p/graphicsmagick/bugs/603/
https://lists.debian.org/debian-lts-announce/2020/01/msg00029.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00064.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00026.html
http://hg.graphicsmagick.org/hg/GraphicsMagick/rev/44ab7f6c20b4