Debian: DSA-4186-1 Critical: Gunicorn HTTP Response Split Fix

It was discovered that gunicorn, an event-based HTTP/WSGI server was
susceptible to HTTP Response splitting.

For the oldstable distribution (jessie), this problem has been fixed
in version 19.0-1+deb8u1.

We recommend that you upgrade your gunicorn packages.

For the detailed security status of gunicorn please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/gunicorn

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/