There are tools you can use to scan and track the contents of your downloaded and deployed container images. However, there are many public sources of container images. When using public container registries, you can add a layer of protection by using trusted sources.
Consuming security updates is particularly important when managing immutable containers. Immutable containers are containers that will never be changed while running. When you deploy immutable containers, you do not step into the running container to replace one or more binaries; you rebuild and redeploy an updated container image.
Red Hat certified images are:
Free of known vulnerabilities in the platform components or layers.
Compatible across the RHEL platforms, from bare metal to cloud.
Supported by Red Hat.
The list of known vulnerabilities is constantly evolving, so you must track the contents of your deployed container images, as well as newly downloaded images, over time. You can use Red Hat Security Advisories (RHSAs) to alert you to any newly discovered issues in Red Hat certified container images, and direct you to the updated image.
More on immutable containers in OKD:
OKD Architecture: Image Streams
OKD Developer Guide: Referencing Images in Image Streams
OKD includes the OpenShift Container Registry, a private registry that runs integrated with the platform that you can use to manage your container images. The OpenShift Container Registry provides role-based access controls that allow you to manage who can pull and push which container images.
OKD also supports integration with other private registries you may already be using.
OKD Architecture: Infrastructure Components → Image Registry