Secunia Security Advisory – Debian has issued an update for libpng. This fixes some vulnerabilities, which can be exploited by malicious people to disclose potentially sensitive information and cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/88507/sa39251.txt
Source: https://packetstormsecurity.com/files/88507/Secunia-Security-Advisory-39251.html