Secunia Security Advisory – Slackware 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/52652/sa23208.txt
Source: https://packetstormsecurity.com/files/52652/Secunia-Security-Advisory-23208.html