Secunia Security Advisory – Debian has issued an update for libpng. This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) or to potentially compromise an application using the library.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75933/sa34423.txt
Source: https://packetstormsecurity.com/files/75933/Secunia-Security-Advisory-34423.html