Mailman before 2.1.9rc1 allows remote attackers to cause a denial of service via unspecified vectors involving "standards-breaking RFC 2231 formatted headers".
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9912
https://exchange.xforce.ibmcloud.com/vulnerabilities/28732
http://www.vupen.com/english/advisories/2006/3446
http://www.ubuntu.com/usn/usn-345-1
http://www.securityfocus.com/bid/19831
http://www.novell.com/linux/security/advisories/2006_25_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:165
http://svn.sourceforge.net/viewvc/mailman/trunk/mailman/Mailman/Utils.py?r1=7859&r2=7923
http://sourceforge.net/project/shownotes.php?group_id=103&release_id=444295
http://securitytracker.com/id?1016808
http://security.gentoo.org/glsa/glsa-200609-12.xml
http://secunia.com/advisories/22639
http://secunia.com/advisories/22020
http://secunia.com/advisories/22011
http://secunia.com/advisories/21879
http://secunia.com/advisories/21837
http://secunia.com/advisories/21792
http://secunia.com/advisories/21732
http://rhn.redhat.com/errata/RHSA-2006-0600.html
http://mail.python.org/pipermail/mailman-announce/2006-September/000087.html