Secunia Security Advisory – Red Hat has issued an update for libpng. This fixes a vulnerability, 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/60393/sa27391.txt
Source: https://packetstormsecurity.com/files/60393/Secunia-Security-Advisory-27391.html