Integer overflow in Opera 10.10 through 10.50 allows remote attackers to execute arbitrary code via a large Content-Length value, which triggers a heap overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/56673
http://www.vupen.com/english/advisories/2010/0529
http://www.securitytracker.com/id?1023690
http://www.opera.com/support/kb/view/948/
http://secunia.com/advisories/38820
http://my.opera.com/securitygroup/blog/2010/03/09/the-malformed-content-length-header-security-issue