The Anchore Engine uses security vulnerability and package data from a number of sources:
Red Hat Enterprise Linux
Software Package Repositories
NIST National Vulnerability Database (NVD)
The Anchore Feed Service collects vulnerability and package data from the upstream sources
and normalizes this data to be published as feeds that the Anchore Engine can subscribe to.
The Anchore engine polls the feed service at a user defined interval, by default every six hours,
and will download feed data updated since the last sync.
Anchore hosts a public service on the Anchore Cloud which provides access, for free, to all public feeds.
An on-premises feed service is available for commercial customers allowing the Anchore Engine to synchronize
with a locally deployed feed service, without any reliance on Anchore Cloud.