A problem was identified in nginx code responsible for saving client request body to a temporary file. A specially crafted request might result in worker process crash due to a NULL pointer dereference while writing client request body to a temporary file (CVE-2016-4450).
The problem affects nginx 1.3.9 - 1.11.0.
The problem is fixed in nginx 1.11.1, 1.10.1.
Patch for nginx 1.9.13 - 1.11.0 can be found here:
Will there be an update for this soon?