Secunia Security Advisory – rPath 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/60245/sa27284.txt
Source: https://packetstormsecurity.com/files/60245/Secunia-Security-Advisory-27284.html