Integer signedness error in Apple Type Services (ATS) in Apple Mac OS X 10.5.8 allows remote attackers to execute arbitrary code via a crafted embedded Compact Font Format (CFF) font in a document.
https://exchange.xforce.ibmcloud.com/vulnerabilities/63170
http://support.apple.com/kb/HT4435
http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html