Secunia Security Advisory – Fedora has issued an update for libpng. This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/60728/sa27492.txt
Source: https://packetstormsecurity.com/files/60728/Secunia-Security-Advisory-27492.html