Secunia Security Advisory – Debian has issued an update for ruby1.8 and ruby1.9. 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/73584/sa33398.txt
Source: https://packetstormsecurity.com/files/73584/Secunia-Security-Advisory-33398.html