Secunia Security Advisory – Ubuntu has issued an update for mailman. This fixes two vulnerabilities, 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/43139/sa18456.txt
Source: https://packetstormsecurity.com/files/43139/Secunia-Security-Advisory-18456.html