Gajim is a Jabber/XMPP client which uses GTK+.
Gajim unconditionally implements the “XEP-0146: Remote Controlling Clients” extension.
Remote attackers, by enticing a user to connect to a malicious XMPP server, could extract plaintext from Off The Record (OTR) encrypted sessions.
There is no known workaround at this time.
All Gajim users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-im/gajim-0.16.6-r1"