feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of service (application crash) via a malformed DOCTYPE declaration.
https://bugzilla.redhat.com/show_bug.cgi?id=684877
http://www.securityfocus.com/bid/46867
http://www.mandriva.com/security/advisories?name=MDVSA-2011:082
http://support.novell.com/security/cve/CVE-2011-1156.html
http://secunia.com/advisories/44074
http://secunia.com/advisories/43730
http://openwall.com/lists/oss-security/2011/03/14/18
http://lists.opensuse.org/opensuse-updates/2011-04/msg00026.html