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, does not properly perform ordered list insertions, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted HTML document, related to the insertion of an unspecified element into an editable container and the access of an uninitialized element.
lists.apple.com/archives/security-announce/2010//Jun/msg00002.html
lists.apple.com/archives/security-announce/2010/Jun/msg00000.html
lists.apple.com/archives/security-announce/2010/Jun/msg00003.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
secunia.com/advisories/40105
secunia.com/advisories/40196
secunia.com/advisories/41856
secunia.com/advisories/43068
securitytracker.com/id?1024067
support.apple.com/kb/HT4196
support.apple.com/kb/HT4220
support.apple.com/kb/HT4225
www.mandriva.com/security/advisories?name=MDVSA-2011:039
www.securityfocus.com/archive/1/511719/100/0/threaded
www.securityfocus.com/bid/40620
www.ubuntu.com/usn/USN-1006-1
www.vupen.com/english/advisories/2010/1373
www.vupen.com/english/advisories/2010/1512
www.vupen.com/english/advisories/2010/2722
www.vupen.com/english/advisories/2011/0212
www.vupen.com/english/advisories/2011/0552
www.zerodayinitiative.com/advisories/ZDI-10-097
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7556