Gajim before 0.16.5 allows remote attackers to modify the roster and intercept messages via a crafted roster-push IQ stanza.
https://hg.gajim.org/gajim/file/gajim-0.16.5/ChangeLog
http://www.debian.org/security/2016/dsa-3492
http://lists.opensuse.org/opensuse-updates/2016-01/msg00027.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175526.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175503.html
http://gultsch.de/gajim_roster_push_and_message_interception.html