ImageIO in Apple Mac OS X 10.4.11 and 10.5.8 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted PixarFilm encoded TIFF image, related to "multiple memory corruption issues."
http://lists.apple.com/archives/security-announce/2009/Sep/msg00004.html
http://secunia.com/advisories/36701