In ImageMagick 7.0.5-5, the ReadARTImage function in coders/art.c allows attackers to cause a denial of service (memory leak) via a crafted .art file.
https://github.com/ImageMagick/ImageMagick/issues/456
https://github.com/ImageMagick/ImageMagick/commit/3b0fe05cddd8910f84e51b4d50099702ea45ba4a