Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote attackers to conduct cross-site scripting (XSS) attacks via control characters in the link scheme to the clean_html function.
http://www.ubuntu.com/usn/USN-2217-1
http://www.openwall.com/lists/oss-security/2014/05/09/7
http://www.mandriva.com/security/advisories?name=MDVSA-2015:112
http://www.debian.org/security/2014/dsa-2941
http://secunia.com/advisories/59008
http://secunia.com/advisories/58744
http://secunia.com/advisories/58013
http://seclists.org/fulldisclosure/2014/Apr/210
http://lxml.de/3.3/changes-3.3.5.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00083.html