CVE-2016-6286
The "spiffy-cgi-handlers" egg would convert a nonexistent "Proxy" header to the HTTP_PROXY environment variable, which would allow attackers to direct CGI programs which use this environment variable to use an attacker-specified HTTP proxy server (also known as a "httpoxy" attack). This affects all versions of spiffy-cgi-handlers before 0.5.
Date published : 2017-01-10
http://www.securityfocus.com/bid/92105
http://lists.gnu.org/archive/html/chicken-announce/2016-07/msg00000.html