ImageMagick 7.0.8-50 Q16 has a heap-based buffer over-read in MagickCore/composite.c in CompositeImage.
https://github.com/ImageMagick/ImageMagick/issues/1603
https://github.com/ImageMagick/ImageMagick/commit/d29148fae06c01ef215940e084cf41853c117bab
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00069.html