A certain hashing algorithm in Telepathy Gabble 0.16.x before 0.16.5 and 0.17.x before 0.17.3 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted message.
http://www.ubuntu.com/usn/USN-1873-1
http://secunia.com/advisories/53779
http://lists.opensuse.org/opensuse-updates/2013-03/msg00085.html
http://lists.freedesktop.org/archives/telepathy/2013-March/006378.html
http://lists.freedesktop.org/archives/telepathy/2013-March/006377.html