An issue was discovered in GraphicsMagick 1.3.26. An allocation failure vulnerability was found in the function ReadOnePNGImage in coders/png.c, which allows attackers to cause a denial of service via a crafted file that triggers an attempt at a large png_pixels array allocation.
https://www.debian.org/security/2018/dsa-4321
https://usn.ubuntu.com/4266-1/
https://lists.debian.org/debian-lts-announce/2018/08/msg00002.html
https://lists.debian.org/debian-lts-announce/2018/03/msg00025.html
http://www.securityfocus.com/bid/103258
http://hg.graphicsmagick.org/hg/GraphicsMagick/rev/cadd4b0522fa