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
https://euvd.enisa.europa.eu/vulnerability/EUVD-2007-3134
http://www.securityfocus.com/bid/24352
http://www.novell.com/linux/security/advisories/2007_15_sr.html
http://www.0x000000.com/?i=334
http://testing.bitsploit.de/test.html
http://security.gentoo.org/glsa/glsa-200708-17.xml