WebKit in Apple Safari before 4.0.2, as used on iPhone OS before 3.1, iPhone OS before 3.1.1 for iPod touch, and other platforms; KHTML in kdelibs in KDE; QtWebKit (aka Qt toolkit); and possibly other products do not properly handle numeric character references, 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/2009/Jul/msg00000.html
lists.apple.com/archives/security-announce/2009/Sep/msg00001.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
osvdb.org/55739
secunia.com/advisories/35758
secunia.com/advisories/36057
secunia.com/advisories/36062
secunia.com/advisories/36347
secunia.com/advisories/36677
secunia.com/advisories/36790
secunia.com/advisories/37746
secunia.com/advisories/43068
support.apple.com/kb/HT3666
support.apple.com/kb/HT3860
websvn.kde.org/?view=rev&revision=1002162
websvn.kde.org/?view=rev&revision=1002163
websvn.kde.org/?view=rev&revision=1002164
www.debian.org/security/2009/dsa-1950
www.mandriva.com/security/advisories?name=MDVSA-2009:330
www.securityfocus.com/bid/35607
www.securitytracker.com/id?1022526
www.ubuntu.com/usn/USN-836-1
www.ubuntu.com/usn/USN-857-1
www.vupen.com/english/advisories/2009/1827
www.vupen.com/english/advisories/2011/0212
bugzilla.redhat.com/show_bug.cgi?id=513813
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5777
www.redhat.com/archives/fedora-package-announce/2009-August/msg00931.html
www.redhat.com/archives/fedora-package-announce/2009-August/msg00933.html
www.redhat.com/archives/fedora-package-announce/2009-July/msg01177.html
www.redhat.com/archives/fedora-package-announce/2009-July/msg01196.html
www.redhat.com/archives/fedora-package-announce/2009-July/msg01199.html
www.redhat.com/archives/fedora-package-announce/2009-July/msg01200.html