In ImageMagick 7.0.7-17 Q16, there is a heap-based buffer over-read in coders/sixel.c in the ReadSIXELImage function, related to the sixel_decode function.
ImageMagick 7.0.7-17 Q16 x86_64 has memory leaks in coders/msl.c, related to MSLPopImage and ProcessMSLScript, and associated with mishandling of MSLPushImage calls.