The jabber_idn_validate function in jutil.c in the Jabber protocol plugin in libpurple in Pidgin before 2.10.10 allows remote attackers to obtain sensitive information from process memory via a crafted XMPP message.
https://access.redhat.com/errata/RHSA-2017:1854
http://www.ubuntu.com/usn/USN-2390-1
http://www.debian.org/security/2014/dsa-3055
http://secunia.com/advisories/61968
http://secunia.com/advisories/60741
http://pidgin.im/news/security/?id=90
http://lists.opensuse.org/opensuse-updates/2014-11/msg00037.html
http://lists.opensuse.org/opensuse-updates/2014-11/msg00023.html