The attachment scrubber (Scrubber.py) in Mailman 2.1.5 and earlier, when using Python's library email module 2.5, allows remote attackers to cause a denial of service (mailing list delivery failure) via a multipart MIME message with a single part that has two blank lines between the first boundary and the end boundary.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9475
http://www.securityfocus.com/bid/17311
http://www.redhat.com/support/errata/RHSA-2006-0486.html
http://www.novell.com/linux/security/advisories/2006_08_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:061
http://www.debian.org/security/2006/dsa-1027
http://securitytracker.com/id?1015851
http://secunia.com/advisories/20782
http://secunia.com/advisories/20624
http://secunia.com/advisories/19571
http://secunia.com/advisories/19545