The Yahoo! protocol plugin in libpurple in Pidgin before 2.10.8 does not properly validate UTF-8 data, which allows remote attackers to cause a denial of service (application crash) via crafted byte sequences.
https://rhn.redhat.com/errata/RHSA-2014-0139.html
http://www.ubuntu.com/usn/USN-2100-1
http://pidgin.im/news/security/?id=70
http://lists.opensuse.org/opensuse-updates/2014-03/msg00005.html
http://lists.opensuse.org/opensuse-updates/2014-02/msg00039.html