Public bug reported:

A remote MSN user that is not on the buddy list can cause a denial of
service (crash) by sending a nudge message. The protocol plugin attempts
to look up the buddy's information and accesses an invalid memory
location if the user is not on the buddy list.

Fixed in version 2.2.1

More info: http://pidgin.im/news/security/?id=23

** Affects: pidgin (Ubuntu)
     Importance: Undecided
         Status: New

** Visibility changed to: Public

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MSN nudges sent from unknown buddies can cause libpurple to crash
https://bugs.launchpad.net/bugs/147103
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