WebKit in Apple Safari before 5.0.3 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.3 on Mac OS X 10.4, does not properly perform a cast of an unspecified variable during processing of inline styling, which allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted web site.
lists.apple.com/archives/security-announce/2010//Nov/msg00002.html
lists.apple.com/archives/security-announce/2010//Nov/msg00003.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
secunia.com/advisories/42314
secunia.com/advisories/43068
support.apple.com/kb/HT4455
support.apple.com/kb/HT4456
www.vupen.com/english/advisories/2010/3046
www.vupen.com/english/advisories/2011/0212
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12079