Containers share a kernel, so a container is not a security boundary by default. This is the practical hardening that makes one act like a boundary — minimal pinned images, a signed and scanned supply chain, dropped capabilities and seccomp, and a Kubernetes securityContext that actually holds.
Cosign
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Container Security in 2026: The Threat Model, the Supply Chain, and a Pod That Can't Hurt You -
Supply Chain Security: SBOMs, Sigstore, Cosign, and SLSA A practical guide to software supply chain security — generating SBOMs with Syft, signing artifacts with Cosign and Sigstore, verifying provenance with SLSA, and integrating these controls into your CI/CD pipeline.