The ReadOneJNGImage function in coders/png.c in GraphicsMagick 1.3.26 allows remote attackers to cause a denial of service (application crash) during JNG reading via a zero-length color_image data structure.Referenceshttp://www.securityfocus.com/bid/99498http://hg.code.sf.net/p/graphicsmagick/code/rev/dea93a690fc1http://hg.code.sf.net/p/graphicsmagick/code/rev/d445af60a8d5https://www.debian.org/security/2018/dsa-4321https://lists.debian.org/debian-lts-announce/2018/08/msg00002.htmlhttps://usn.ubuntu.com/4206-1/
