The International Domain Name (IDN) support in Epiphany allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other character sets, which facilitates phishing attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19236
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0239
https://bugzilla.redhat.com/beta/show_bug.cgi?id=147399
http://www.shmoo.com/idn/homograph.txt
http://www.securityfocus.com/bid/12461
http://lists.grok.org.uk/pipermail/full-disclosure/2005-February/031459.html