When GraphicsMagick 1.3.25 processes a DPX image (with metadata indicating a large width) in coders/dpx.c, a denial of service (OOM) can occur in ReadDPXImage().
https://www.debian.org/security/2018/dsa-4321
https://usn.ubuntu.com/4206-1/
https://lists.debian.org/debian-lts-announce/2019/04/msg00015.html
http://www.securityfocus.com/bid/99358
http://hg.code.sf.net/p/graphicsmagick/code/rev/f10b9bb3ca62