Visual truncation vulnerability in Opera 9.21 allows remote attackers to spoof the address bar and possibly conduct phishing attacks via a long hostname, which is truncated after 34 characters, as demonstrated by a phishing attack using HTTP Basic Authentication.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34983
http://www.novell.com/linux/security/advisories/2007_15_sr.html
http://testing.bitsploit.de/test.html
http://security.gentoo.org/glsa/glsa-200708-17.xml