Secunia Security Advisory – Gentoo has issued an update for optipng. This fixes a vulnerability, which potentially can be exploited by malicious people to compromise a user’s system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/72572/sa32962.txt
Source: https://packetstormsecurity.com/files/72572/Secunia-Security-Advisory-32962.html