The Javascript SVG support in Opera before 9.10 does not properly validate object types in a createSVGTransformFromMatrix request, which allows remote attackers to execute arbitrary code via JavaScript code that uses an invalid object in this request that causes a controlled pointer to be referenced during the virtual function call.
http://www.vupen.com/english/advisories/2007/0060
http://www.opera.com/support/search/supsearch.dml?index=851
http://www.gentoo.org/security/en/glsa/glsa-200701-08.xml
http://securitytracker.com/id?1017473
http://secunia.com/advisories/23771
http://secunia.com/advisories/23739
http://secunia.com/advisories/23613
http://lists.suse.com/archive/suse-security-announce/2007-Jan/0009.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=458