Docker before 1.3.3 does not properly validate image IDs, which allows remote attackers to conduct path traversal attacks and spoof repositories via a crafted image in a (1) "docker load" operation or (2) "registry communications."
https://groups.google.com/forum/#%21msg/docker-user/nFAz-B-n4Bw/0wr3wvLsnUwJ
http://www.securityfocus.com/archive/1/534215/100/0/threaded