Use-after-free vulnerability in WebKit in Apple Safari before 4.0.5 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via an HTML document with improperly nested tags.Referenceshttp://www.mandriva.com/security/advisories?name=MDVSA-2011:039http://lists.apple.com/archives/security-announce/2010/Mar/msg00000.htmlhttps://exchange.xforce.ibmcloud.com/vulnerabilities/56836http://www.vupen.com/english/advisories/2010/2722http://secunia.com/advisories/43068http://www.ubuntu.com/usn/USN-1006-1http://www.securitytracker.com/id?1023708http://secunia.com/advisories/41856http://www.vupen.com/english/advisories/2011/0212http://support.apple.com/kb/HT4225http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041383.htmlhttp://support.apple.com/kb/HT4070http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.htmlhttp://www.vupen.com/english/advisories/2011/0552https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7587http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041432.htmlhttp://lists.apple.com/archives/security-announce/2010/Jun/msg00003.htmlhttp://www.securityfocus.com/bid/38671http://lists.fedoraproject.org/pipermail/package-announce/2010-May/041436.html