The read_user_chunk_callback function in coders\png.c in ImageMagick 7.0.6-1 Q16 2017-06-21 (beta) has memory leak vulnerabilities via crafted PNG files.
https://github.com/ImageMagick/ImageMagick/issues/517
https://github.com/ImageMagick/ImageMagick/commit/8ca35831e91c3db8c6d281d09b605001003bec08