The ReadJPEGImage function in coders/jpeg.c in ImageMagick before 7.0.6-1 allows remote attackers to obtain sensitive information from uninitialized memory locations via a crafted file.
https://github.com/ImageMagick/ImageMagick/issues/556
https://github.com/ImageMagick/ImageMagick/commit/f6463ca9588579633bbaed9460899d892aa3c64a