WebKit in Apple Safari before 5.0.1 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1.1 on Mac OS X 10.4; and webkitgtk before 1.2.6; does not properly handle dynamic modification of a text node, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted HTML document.
lists.apple.com/archives/security-announce/2010//Jul/msg00001.html
lists.apple.com/archives/security-announce/2010//Nov/msg00003.html
lists.apple.com/archives/security-announce/2010//Sep/msg00002.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
secunia.com/advisories/41856
secunia.com/advisories/42314
secunia.com/advisories/43068
secunia.com/advisories/43086
support.apple.com/kb/HT4276
support.apple.com/kb/HT4334
support.apple.com/kb/HT4456
www.debian.org/security/2011/dsa-2188
www.mandriva.com/security/advisories?name=MDVSA-2011:039
www.redhat.com/support/errata/RHSA-2011-0177.html
www.securityfocus.com/bid/42020
www.ubuntu.com/usn/USN-1006-1
www.vupen.com/english/advisories/2010/2722
www.vupen.com/english/advisories/2011/0212
www.vupen.com/english/advisories/2011/0216
www.vupen.com/english/advisories/2011/0552
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11820