nginx is a robust, small, and high performance HTTP and reverse proxy server.
An SSL session fixation vulnerability has been found in nginx when multiple servers use the same shared ssl_session_cache or ssl_session_ticket_key.
A remote attacker may be able to obtain sensitive information.
There is no known workaround at this time.
All nginx users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-1.7.6"