Opera 8.50 allows remote attackers to cause a denial of service (crash) via a Java applet with a large string argument to the removeMember JNI method for the com.opera.JSObject class.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-3941
http://www.securityfocus.com/bid/15648
http://www.securityfocus.com/archive/1/418274/100/0/threaded
http://www.securityfocus.com/archive/1/418201/100/0/threaded
http://www.illegalaccess.org/exploit/opera85/OperaApplet.html