mod_wsgi module before 3.4 for Apache, when used in embedded mode, might allow remote attackers to obtain sensitive information via the Content-Type header which is generated from memory that may have been freed and then overwritten by a separate thread.
http://www.securityfocus.com/bid/67534
http://www.openwall.com/lists/oss-security/2014/05/21/1
http://modwsgi.readthedocs.org/en/latest/release-notes/version-3.4.html
http://blog.dscpl.com.au/2014/05/security-release-for-modwsgi-version-35.html