nginx is a robust, small, and high performance HTTP and reverse proxy server.
A bug in the SPDY implementation in nginx was found which might cause a heap memory buffer overflow in a worker process by using a specially crafted request. The SPDY implementation is not enabled in default configurations.
A remote attacker could cause execution of arbitrary code by using a specially crafted request.
Disable the spdy module in NGINX_MODULES_HTTP.
All nginx users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-1.4.7"