Docker Engine before 1.8.3 and CS Docker Engine before 1.6.2-CS7 do not use a globally unique identifier to store image layers, which makes it easier for attackers to poison the image cache via a crafted image in pull or push commands.
https://www.docker.com/legal/docker-cve-database
https://groups.google.com/forum/#%21msg/docker-dev/bWVVtLNbFy8/UaefOqMOCAAJ
https://github.com/docker/docker/blob/master/CHANGELOG.md#183-2015-10-12
http://lists.opensuse.org/opensuse-updates/2015-10/msg00036.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00014.html