An image version is a maintained release instance of a container image. It may represent a rebuild with security patches, a change for a different CPU architecture, or a refreshed image with updated metadata while keeping the same overall application purpose. In practice, teams use image versions to track exactly which release is approved for deployment.
Image versions matter because containers are often distributed and consumed by digest or tag, and security depends on knowing which exact artifact is running. Defenders use versioning to roll out fixes, compare builds, and verify provenance, signatures, and SBOMs. Attackers may exploit poor version control by swapping tags, pushing lookalike releases, or relying on stale images that still contain known vulnerabilities. A clear versioning scheme helps ensure that the deployed image matches the trusted build.