The OSCAR protocol plugin in libpurple in Pidgin before 2.6.3 and Adium before 1.3.7 allows remote attackers to cause a denial of service (application crash) via crafted contact-list data for (1) ICQ and possibly (2) AIM, as demonstrated by the SIM IM client.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9414
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18388
https://exchange.xforce.ibmcloud.com/vulnerabilities/53807
http://www.vupen.com/english/advisories/2010/1020
http://www.vupen.com/english/advisories/2009/2951
http://www.vupen.com/english/advisories/2009/2949
http://www.securityfocus.com/bid/36719
http://www.pidgin.im/news/security/?id=41
http://www.mandriva.com/security/advisories?name=MDVSA-2010:085
http://secunia.com/advisories/37072
http://secunia.com/advisories/37017
http://developer.pidgin.im/wiki/ChangeLog
http://developer.pidgin.im/viewmtn/revision/info/781682333aea0c801d280c3507ee25552a60bfc0