In ImageMagick 7.0.5-7 Q16, an assertion failure was found in the function SetPixelChannelAttributes, which allows attackers to cause a denial of service via a crafted file.
https://github.com/ImageMagick/ImageMagick/issues/492
https://github.com/ImageMagick/ImageMagick/commit/7fd419441bc7103398e313558171d342c6315f44