ImageMagick 7.0.8-5 has a memory leak vulnerability in the function ReadOneJNGImage in coders/png.c.
https://usn.ubuntu.com/3785-1/
https://github.com/ImageMagick/ImageMagick/issues/1201
https://github.com/ImageMagick/ImageMagick/commit/76efa969342568841ecf320b5a041685a6d24e0b