The msn_slp_process_msg function in libpurple/protocols/msn/slpcall.c in the MSN protocol plugin in libpurple 2.6.0 and 2.6.1, as used in Pidgin before 2.6.2, allows remote attackers to cause a denial of service (application crash) via a handwritten (aka Ink) message, related to an uninitialized variable and the incorrect "UTF16-LE" charset name.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6338
http://www.securityfocus.com/bid/36277
http://www.pidgin.im/news/security/index.php?id=38
http://secunia.com/advisories/36601
http://developer.pidgin.im/viewmtn/revision/info/567e16cbc46168f52482e5ec27626c48e7a5ba95