ImageMagick before 7.0.7-12 has a coders/png.c Magick_png_read_raw_profile heap-based buffer over-read via a crafted file, related to ReadOneMNGImage.
https://github.com/ImageMagick/ImageMagick/issues/872
https://lists.debian.org/debian-lts-announce/2018/01/msg00000.html
https://usn.ubuntu.com/3681-1/