How secure OCI containers enable NIS2 and FedRAMP compliance
Secure OCI containers are becoming essential for organizations aiming to meet NIS2 and FedRAMP compliance requirements. In this article, we explain how Hardened’s approach to secure OCI containers strengthens the software supply chain, reduces CVE exposure, and enables consistent STIG-aligned deployment practices.
Target audience: Enterprise Architects, Security Architects, CISOs, Security Officers, Risk & Compliance Managers, and IT Governance Leaders
Introduction: Why Container Supply Chain Security Matters
Container platforms, Kubernetes clusters, and cloud-native workloads accelerate development, but they also introduce new risks. Traditional security guidelines such as Security Technical Implementation Guides (STIGs) were designed for physical hardware and conventional software, not for highly dynamic OCI container environments.
As organizations increasingly adopt containers, the need for container-specific security guidance has become critical.
What STIGs Are and Why They Fall Short for Containers
STIGs provide configuration requirements used across U.S. Department of Defense (DoD) systems and by organizations aiming for FedRAMP or NIST 800-53 compliance.
However:
- STIGs were built for static systems, not ephemeral containers
- Many controls apply to the host OS, not the container image
- Only a subset maps cleanly to OCI container security
This creates gaps for teams relying on containers in regulated environments.
How Hardened EU Strengthens Container Image Security
Hardened EU provides ultra-minimal, secure OCI container images in which known Common Vulnerabilities and Exposures (CVEs) are almost entirely eliminated. Because the images contain only the components strictly required for application execution, the attack surface is dramatically reduced. This makes it significantly easier for organizations to meet the expectations of major security and compliance frameworks such as FedRAMP, PCI DSS v4.0,NIS2, NIST 800-53 and the CIS Benchmarks.
All of which place strong emphasis on risk reduction, software integrity, and continuous vulnerability management.
Hardened Images
What sets Hardened images apart is the combination of minimalism, transparency, and secure defaults. By removing unnecessary packages and tools, the images leave little room for attackers to exploit. This minimalism directly contributes to a near-zero CVE baseline, while full image signing and complete SBOM visibility ensure that every component can be traced and verified. Hardened containers also never run as root, which adds another layer of protection by preventing common privilege-escalation pathways. Together, these characteristics align closely with NIS2 requirements, which explicitly emphasize the need for software integrity, secure software supply chains, and continuous assessment of vulnerabilities.
How NIST, FedRAMP, and CIS Guidelines Apply to Containers
Compliance frameworks such as FedRAMP and NIST 800-53 classify systems before determining which security controls apply to them. In the case of FedRAMP, this begins with a FIPS-199 impact assessment, which then determines which NIST 800-53 controls must be implemented. Because NIST 800-53 is technology-neutral, organizations rely on interpretation documents such as STIGs and the CIS Benchmarks to understand how these controls should be applied to specific technologies.
FedRAMP rules
Under FedRAMP rules, organizations must follow STIG guidance when available; if a relevant STIG does not exist, they are expected to apply CIS Level 2 Benchmarks, and only if neither option is available may a custom baseline be defined. This presents a unique challenge in containerized environments, because many security controls do not apply directly to the image itself. Some are inherited from the hardened host operating system, others relate to Kubernetes or the container runtime, and only a fraction map directly to the container image. Hardened secure OCI images therefore deliver substantial value, as they remove ambiguity and reduce the number of controls that teams must interpret or implement manually.
How DoD and DISA Address Container Security
The U.S. Department of Defense recognized early on that containers behave very differently from traditional operating systems. As a result, DoD DevSecOps initiatives developed dedicated container-hardening guidance that reflects the fundamental nature of containerized environments. Containers are immutable, inherit many controls from their host, and shift the security emphasis from long-term configuration management to image integrity and continuous vulnerability hygiene.
Hardened images
Hardened EU follows this same modern security model. When Hardened images run on a STIG-hardened host, many required security controls are automatically inherited from the underlying infrastructure. This reduces container-specific risk, simplifies compliance documentation, and shortens audit preparation cycles. Hardened EU further supports this approach through SLA-backed vulnerability remediation, ensuring that emerging vulnerabilities are addressed quickly and consistently, an expectation that appears in both FedRAMP and NIS2.
How Hardened EU Helps Organizations Meet NIS2
NIS2 introduces stringent obligations related to software supply-chain integrity, secure configuration management, vulnerability mitigation, and traceability. These requirements assume that organizations can demonstrate exactly what software they run, how it was built, and how quickly vulnerabilities can be remediated.
Hardened secure OCI containers fit naturally into this model. They offer fully reproducible builds, complete SBOM transparency, and enforced non-root execution, which collectively limit the impact of potential compromises. Because the images contain no unnecessary binaries or privileged tools, the potential for lateral movement, escalation, or exploitation is dramatically reduced. Combined with a near-zero CVE baseline and rapid remediation cycles, Hardened EU enables organizations to meet NIS2’s expectations for secure-by-design software environments and resilient supply chains.
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More information: https://hardened.eu
Appendix C: Security Control Inheritance (Original Excerpt)
UNCLASSIFIED
Container Hardening Process Guide, V1R2 DISA
24 August 2022 – Developed by DISA for the DOD p.18
APPENDIX C: SECURITY CONTROL INHERITANCE
PaaS/Platform Host providers rely on technical concepts such as process isolation, service routing, redundancy, firewall controls, and many other security layers. These typically align with DOD security concepts “out of the box”. Security overlays should always be leveraged (STIG, NIST 800-53, etc.). Ensure the selected host operating system has significant DISA STIG involvement, including security guidance/standards where available.
Leverage hardened Infrastructure as Code and Configuration as Code from Repo One whenever available to install various Kubernetes distributions supported by the Container Hardening team.
With a properly locked down hosting environment, containers inherit most of the security controls and benefits from infrastructure to host OS-level remediation requirements. The focus then shifts to container security requirements and application security requirements (e.g., static code analysis, unit testing, library Common Vulnerabilities and Exposure [CVE] testing, etc.)
Source: Container Hardening Process Guide, V1R2 DISA, 24 August 2022
https://dl.dod.cyber.mil/wp-content/uploads/devsecops/pdf/Final_DevSecOps_Enterprise_Container_Hardening_Guide_1.2.pdf