source: http://www.securityfocus.com/bid/11975/info

Yanf is prone to a buffer overflow vulnerability. This issue is exposed when the client reads data from a remote HTTP server.

If this issue is successfully exploited, it could allow for execution of arbitrary code in the context of the user running the client. 

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/24980.zip