Use-after-free vulnerability in WebKit in Apple Safari before 5.0 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1 on Mac OS X 10.4, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via vectors related to the Cascading Style Sheets (CSS) run-in property and multiple invocations of a destructor for a child element that has been referenced multiple times.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7180
http://www.zerodayinitiative.com/advisories/ZDI-10-101
http://www.vupen.com/english/advisories/2011/0212
http://www.vupen.com/english/advisories/2010/1512
http://www.vupen.com/english/advisories/2010/1373
http://www.securityfocus.com/bid/40620
http://www.securityfocus.com/archive/1/511725/100/0/threaded
http://support.apple.com/kb/HT4220
http://support.apple.com/kb/HT4196
http://securitytracker.com/id?1024067
http://secunia.com/advisories/43068
http://secunia.com/advisories/40196
http://secunia.com/advisories/40105
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://lists.apple.com/archives/security-announce/2010/Jun/msg00000.html
http://lists.apple.com/archives/security-announce/2010//Jun/msg00002.html