Pidgin: Multiple NULL pointer dereference flaws in Yahoo protocol plug-in

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...