Cerulean Studios Trillian Pro before 3.1.5.1 allows remote attackers to obtain potentially sensitive information via long CTCP PING messages that contain UTF-8 characters, which generates a malformed response that is not truncated by a newline, which can cause portions of a server message to be sent to the attacker.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33983
http://www.securitytracker.com/id?1017982