LuaExpat before 1.2.0 does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.
https://exchange.xforce.ibmcloud.com/vulnerabilities/67862
https://bugzilla.redhat.com/show_bug.cgi?id=711027
http://www.securityfocus.com/bid/48123
http://www.openwall.com/lists/oss-security/2011/06/06/4
http://www.openwall.com/lists/oss-security/2011/06/06/19