It was discovered that irssi-otr had a flaw in handing data returned by libotr. After the initiation of the OTR session only the first line was sent as a PRIVMSG, while additional data would be sent as raw commands to the IRC server. The additional data would ordinarily be a human-readable HTML-formatted instruction message from libotr, a fixed string. However this is a minor security concern and the remediation avoids further security issues.