OCI stands for the Open Container Initiative, a standards body that defines how container images and runtimes should be formatted and handled. In practice, OCI specifications help tools from different vendors build, store, move, and run containers in a consistent way, which reduces compatibility problems across registries, CI systems, and orchestration platforms.
In cyber security, OCI matters because container images are part of the software supply chain. Attackers may target registries that store OCI images to steal source code, embedded secrets, or deployment details. Defenders rely on OCI-compatible tooling to inspect image metadata, verify digests, and enforce signing or policy checks before deployment. When a registry authorization flaw occurs, as in a private image exposure case, the risk is not just leaked files: the attacker may learn how applications are built, what credentials are baked into layers, and how internal infrastructure is configured.