OpenStack Glance 2014.2.x through 2014.2.1, 2014.1.3, and earlier allows remote authenticated users to bypass the storage quota and cause a denial of service (disk consumption) by deleting an image in the saving state.
https://security.openstack.org/ossa/OSSA-2015-003.html
https://bugs.launchpad.net/glance/+bug/1383973
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.openwall.com/lists/oss-security/2015/01/18/4
http://secunia.com/advisories/62165
http://rhn.redhat.com/errata/RHSA-2015-0838.html