Apple Safari RCE (CVE-2010-0049):
Apple Safari contains a programming error that may allow a remote atttacker to execute code on an affected system. The issue presents itself when the browser fails to properly process certain HTML elements concerning RTL text.

Additionally, as a result of ongoing research, the Sourcefire VRT has added multiple rules to the specific-threats and netbios rule sets to provide coverage for emerging threats from these technologies.

Check out the changelogs here: http://www.snort.org/vrt/advisories/2010/03/23/vrt-rules-2010-03-23.html