Opera before 11.50 allows remote attackers to cause a denial of service (disk consumption) via invalid URLs that trigger creation of error pages.
jvn.jp/en/jp/JVN47757122/index.html
jvndb.jvn.jp/ja/contents/2011/JVNDB-2011-000049.html
secunia.com/advisories/45060
www.opera.com/docs/changelogs/mac/1150/
www.opera.com/docs/changelogs/unix/1150/
www.opera.com/docs/changelogs/windows/1150/
www.opera.com/support/kb/view/996/
www.osvdb.org/73486
www.securityfocus.com/bid/48501
exchange.xforce.ibmcloud.com/vulnerabilities/68323