An issue was discovered in GraphicsMagick 1.3.26. An allocation failure vulnerability was found in the function ReadTIFFImage in coders/tiff.c, which allows attackers to cause a denial of service via a crafted file, because file size is not properly used to restrict scanline, strip, and tile allocations.
https://www.debian.org/security/2018/dsa-4321
https://usn.ubuntu.com/4266-1/
https://sourceforge.net/p/graphicsmagick/bugs/461/
https://lists.debian.org/debian-lts-announce/2018/08/msg00002.html
https://lists.debian.org/debian-lts-announce/2018/03/msg00025.html