Apple has issued Security Update 2010-005 for both Snow Leopard 10.6 (81 Mb download) and Leopard 10.5 (212 Mb download) Client operating systems as well as their respective Server versions. The patch corrects 13 vulnerabilities which could potentially allow hackers to issue arbitrary code to an unsuspecting user.

Major processes the update addresses include those concerning font handling, PDFs, core graphics, PHP, and networking. Details can be found here.

Security Update 2010-005 can be downloaded and applied via the above links or by using Software Update.