tif_getimage.c in LibTIFF 3.9.0 and 3.9.2 on 64-bit platforms, as used in ImageMagick, does not properly perform vertical flips, which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted TIFF image, related to "downsampled OJPEG input."
http://marc.info/?l=oss-security&m=127731610612908&w=2
https://bugzilla.redhat.com/show_bug.cgi?id=583081
https://bugzilla.redhat.com/show_bug.cgi?id=607198
http://secunia.com/advisories/40422
http://secunia.com/advisories/50726