MHonArc 2.6.16 allows remote attackers to cause a denial of service (CPU consumption) via start tags that are placed within other start tags, as demonstrated by a <bo<bo<bo<bo<body>dy>dy>dy>dy> sequence, a different vulnerability than CVE-2010-4524.
https://exchange.xforce.ibmcloud.com/vulnerabilities/64656
http://www.vupen.com/english/advisories/2011/0067
http://www.vupen.com/english/advisories/2010/3344
http://www.mail-archive.com/mhonarc-dev%40mhonarc.org/msg01297.html
http://secunia.com/advisories/42694
http://savannah.nongnu.org/bugs/?32014
http://lists.mandriva.com/security-announce/2011-01/msg00004.php