libymsg.c in the Yahoo! protocol plugin in libpurple in Pidgin 2.6.0 through 2.7.10 allows (1) remote authenticated users to cause a denial of service (NULL pointer dereference and application crash) via a malformed YMSG notification packet, and allows (2) remote Yahoo! servers to cause a denial of service (NULL pointer dereference and application crash) via a malformed YMSG SMS message.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18402
https://hermes.opensuse.org/messages/13195955
https://exchange.xforce.ibmcloud.com/vulnerabilities/66055
https://bugzilla.redhat.com/show_bug.cgi?id=683031
http://www.vupen.com/english/advisories/2011/0703
http://www.vupen.com/english/advisories/2011/0669
http://www.vupen.com/english/advisories/2011/0661
http://www.vupen.com/english/advisories/2011/0643
http://www.securityfocus.com/bid/46837
http://www.redhat.com/support/errata/RHSA-2011-1371.html
http://www.redhat.com/support/errata/RHSA-2011-0616.html
http://www.pidgin.im/news/security/?id=51
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.466884
http://secunia.com/advisories/46376
http://secunia.com/advisories/43721
http://secunia.com/advisories/43695
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056309.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055874.html
http://developer.pidgin.im/viewmtn/revision/info/a7c415abba1f5f01f79295337518837f73d99bb7