Apple Type Services (ATS) in Apple Mac OS X through 10.6.8 does not properly handle embedded Type 1 fonts, which allows remote attackers to execute arbitrary code via a crafted document that triggers an out-of-bounds memory access.
http://www.securityfocus.com/bid/50091
http://www.securityfocus.com/bid/50085
http://support.apple.com/kb/HT5002
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html