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The Client class performs a lot URL construction like this:

        res = self._get(self._url("/exec/{0}/json".format(exec_id)))

This can be used to manipulate the query string if exec_id contains characters like '?' and '/', which can lead to vulnerabilities elsewhere.  The client code should be fixed to reject such invalid parameters.

Upstream issue: https://github.com/docker/docker-py/issues/697

Fixed upstream:

https://github.com/docker/docker-py/pull/752

Fix for this should already be available in python-docker-py-1.7.2-1.el7