The IsPixelMonochrome function in MagickCore/pixel-accessor.h in ImageMagick 7.0.3.0 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via a crafted file. NOTE: the vendor says This is a Q64 issue and we do not support Q64. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8678
