Ubuntu Security Notice 548-1 – It was discovered that Pidgin did not correctly handle certain logging events. A remote attacker could send specially crafted messages and cause the application to crash, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/61347/USN-548-1.txt
Source: https://packetstormsecurity.com/files/61347/Ubuntu-Security-Notice-548-1.html