Pidgin version 2.6.1 suffers from a remote denial of service vulnerability when receiving a malformed IRC TOPIC message from a malicious IRC server.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81035/IS-2009-01.txt
Source: https://packetstormsecurity.com/files/81035/Pidgin-IRC-TOPIC-Message-Denial-Of-Service.html