Apple has released a security update for users of Mac OS X 10.5 (“Leopard”) and 10.6 (“Snow Leopard”), as well as Server Admin Tools 10.6.3
Security Update 2010-003 for Snow Leopard (http://support.apple.com/kb/DL1029), Leopard Client (http://support.apple.com/kb/DL1027) and Leopard Server (http://support.apple.com/kb/DL1028) fixes an issue with the potential execution of arbitrary code when viewing or even just downloading a document with a maliciously crafted embedded font.
Server Admin Tools 10.6.3 (http://support.apple.com/kb/DL1032) contains remote administration tools, documentation, and utilities that you can install on a computer other than your server. The Server Admin Tools update is recommended for remote administration of Snow Leopard Server.