Heap-based buffer overflow in Apple Type Services (ATS) in Apple Mac OS X before 10.6.8 allows remote attackers to execute arbitrary code via a crafted embedded TrueType font.
http://www.securityfocus.com/bid/48436
http://support.apple.com/kb/HT4723
http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html