Buffer overflow in the xmlrpc_char_encode function in modules/transport/xmlrpc/xmlrpclib.c in Atheme before 7.2.7 allows remote attackers to cause a denial of service via vectors related to XMLRPC response encoding.
https://github.com/atheme/atheme/commit/87580d767868360d2fed503980129504da84b63e
http://www.openwall.com/lists/oss-security/2016/05/03/1
http://www.openwall.com/lists/oss-security/2016/05/02/2
http://www.debian.org/security/2016/dsa-3586
http://lists.opensuse.org/opensuse-updates/2016-05/msg00061.html