The OJPEGPostDecode function in tif_ojpeg.c in LibTIFF 3.9.0 and 3.9.2, as used in tiff2ps, allows remote attackers to cause a denial of service (assertion failure and application exit) 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
http://secunia.com/advisories/40422