Secunia Security Advisory – Debian has issued an update for libpng. This fixes two vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) and compromise an application using the library.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/91988/sa40547.txt
Source: https://packetstormsecurity.com/files/91988/Secunia-Security-Advisory-40547.html