The msn_emoticon_msg function in slp.c in the MSN protocol plugin in libpurple in Pidgin before 2.7.0 allows remote authenticated users to cause a denial of service (NULL pointer dereference and application crash) via a custom emoticon in a malformed SLP message.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18547
https://exchange.xforce.ibmcloud.com/vulnerabilities/58559
https://bugzilla.redhat.com/show_bug.cgi?id=589973
https://euvd.enisa.europa.eu/vulnerability/EUVD-2010-1647
http://www.vupen.com/english/advisories/2010/2755
http://www.vupen.com/english/advisories/2010/1141
http://www.securityfocus.com/bid/40138
http://www.pidgin.im/news/security/index.php?id=46
http://www.mandriva.com/security/advisories?name=MDVSA-2010:097
http://secunia.com/advisories/41899
http://secunia.com/advisories/39801
http://developer.pidgin.im/viewmtn/revision/info/894460d22c434e73d60b71ec031611988e687c8b