The irc_msg_who function in msgs.c in the IRC protocol plugin in
libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not
properly validate characters in nicknames, which allows user-assisted
remote attackers to cause a denial of service (NULL pointer
dereference and application crash) via a crafted nickname that is not
properly handled in a WHO response.
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