Pidgin's libpurple vulnerable to multiple denial of service attacks.

http://www.securityfocus.com/bid/36277/info

Successful exploits of a libpurple vulnerability will lead to crashes in
Pidgin.

"Pidgin Libpurple 2.6.1 and prior versions are affected."

This affects the IRC, XMPP and MSN chat clients which use libpurple. It
is recommended that users upgrade their Pidgin/libpurple installations
to a newer, fixed version.