A waitress security update has been released for Debian GNU/Linux 8 LTS. It was discovered that there was a HTTP request smuggling vulnerability in waitress, pure-Python WSGI server.

Package : waitress
Version : 0.8.9-2+deb8u1
Debian Bug : #765126

It was discovered that there was a HTTP request smuggling
vulnerability in waitress, pure-Python WSGI server.

If a proxy server is used in front of waitress, an invalid request
may be sent by an attacker that bypasses the front-end and is parsed
differently by waitress leading to a potential for request smuggling.

Specially crafted requests containing special whitespace characters
in the Transfer-Encoding header would get parsed by Waitress as being
a chunked request, but a front-end server would use the
Content-Length instead as the Transfer-Encoding header is considered
invalid due to containing invalid characters. If a front-end server
does HTTP pipelining to a backend Waitress server this could lead to
HTTP request splitting which may lead to potential cache poisoning or
information disclosure.

For Debian 8 "Jessie", this issue has been fixed in waitress version
0.8.9-2+deb8u1.

We recommend that you upgrade your waitress packages.

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