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.
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