Format string vulnerability in Mailman before 2.1.9 allows attackers to execute arbitrary code via unspecified vectors. NOTE: the vendor has disputed this vulnerability, stating that it is "unexploitable.
http://www.novell.com/linux/security/advisories/2006_25_sr.html
http://secunia.com/advisories/22639
http://secunia.com/advisories/21732
http://people.debian.org/~terpstra/message/20060906.155339.0c0732a4.en.html
http://mail.python.org/pipermail/mailman-announce/2006-September/000087.html