ImageMagick 7.0.8-50 Q16 has a heap-based buffer over-read at MagickCore/pixel-accessor.h in GetPixelChannel.
https://github.com/ImageMagick/ImageMagick/issues/1610
https://github.com/ImageMagick/ImageMagick/commit/8187d2d8fd010d2d6b1a3a8edd935beec404dddc
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00069.html