Integer overflow in ImageIO in Apple Mac OS X 10.4.7 allows user-assisted attackers to cause a denial of service (crash) and possibly execute arbitrary code via a malformed GIF image.
http://lists.apple.com/archives/security-announce/2006//Aug/msg00000.html
http://secunia.com/advisories/21253
https://exchange.xforce.ibmcloud.com/vulnerabilities/28145
http://www.kb.cert.org/vuls/id/605908