Apply zero trust to a CI/CD pipeline by treating every person, service, device, repository, build environment, and artifact as something that must be identified and checked—not trusted merely because it is inside the corporate network or already passed an earlier stage. Map the pipeline’s actors and handoffs, authenticate and authorize each actor for specific actions, protect build execution, verify source and artifact integrity, and repeat checks as software moves toward deployment.
What zero trust means for a CI/CD pipeline
Zero trust shifts security away from relying on a network perimeter. NIST’s model focuses on users, assets, and resources, and says that neither network location nor enterprise ownership alone establishes trust. Access to an enterprise resource calls for authentication and authorization of both the subject and the device. NIST SP 800-207
For a pipeline, the protected resources include more than source code and deployment targets. The trust chain also includes the people and services that build, package, and deploy software; source and package repositories; third-party components; build systems; and the artifacts that pass between stages. NIST SP 800-204D identifies pipeline stages such as build, test, package, and deploy, and calls for entity authentication, policy-based permissions, integrity verification, and checks on build-step inputs and outputs. NIST SP 800-204D
The operational implication is that passing one check does not confer blanket trust for everything that follows. A valid developer login, for example, does not by itself authorize a production deployment; a signed artifact still needs to be evaluated as part of the broader chain of source, build, and handoff checks. That is an implementation interpretation of NIST’s separate authentication, authorization, and integrity recommendations—not a claim that NIST mandates one particular workflow or product.
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How to apply zero trust to a CI/CD pipeline
Use the following sequence to turn the model into controls. The exact identities, permissions, and verification mechanisms depend on the organization’s pipeline and policies; the goal is to make each trust decision explicit and repeatable.
1. Map actors, resources, and handoffs
Inventory the entities that can touch software and the resources they use. Include human users, automation identities, build workers, source repositories, package registries, signing or attestation components, deployment identities, and artifacts. For each, record which actions it can initiate or approve: changing source, starting a build, packaging, publishing, or deploying.
Then trace how code and artifacts move between stages. Mark where a component is fetched, where a build runs, where an artifact is stored or transformed, and where deployment consumes it. This gives the team a practical map of the identities and handoffs that need protection, rather than treating “the pipeline” as one undifferentiated system.
2. Authenticate identities and grant action-specific permissions
Authenticate the people and services that perform supply-chain activities, and authorize them according to enterprise policy. Distinguish roles for actions such as source changes, build execution, packaging, and deployment. Check devices as well as users where they access protected resources, consistent with the subject-and-device model in NIST SP 800-207.
Do not treat a successful login, access to a trusted subnet, or permission to read a repository as authorization for every later pipeline action. For each identity, define which resources and operations it needs; avoid making one credential or role implicitly responsible for unrelated stages. This is a practical way to apply NIST’s authentication and authorization principles alongside SP 800-204D’s guidance on roles and permissions.
3. Protect the build environment
Secure the environment that executes pipeline jobs, including the virtual machines or pods used by workers. Reduce its attack surface, define policies for the build platforms and tools, and use secure, isolated build platforms where appropriate. NIST SP 800-204D identifies hardened execution environments and secure isolated build platforms among the relevant CI/CD supply-chain measures.
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Include the build environment in the pipeline’s trust map: identify which jobs can use it, which identities can change its configuration, and which inputs it receives. Treating a worker as a resource to protect makes it less likely that a trusted network location or a job’s successful start will be mistaken for proof that its execution is trustworthy.
4. Verify sources, artifacts, and build steps
Check the integrity of repositories and artifacts using their associated digital signatures, and re-establish trust as artifacts move through repositories and into the final product. Also verify each build step’s inputs and outputs so there is evidence that the expected component or entity performed the expected process. These are distinct checks: a signature supports an integrity decision, while input/output checks address what happened during the build. NIST describes both within the broader supply-chain trust chain in SP 800-204D.
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5. Manage third-party and open-source components
Include dependencies in the supply-chain controls. NIST’s Software Security in Supply Chains: Open Source Software Controls recommends software composition analysis (SCA) to identify publicly known vulnerabilities in open-source components, secure acquisition channels, and trustworthy repositories such as vetted component libraries.
For sustained capability, the NIST guidance also discusses binary SCA, hardened internal repositories or sandboxes, and automating the collection and scanning of components before they enter development environments. These practices help teams assess components and their sources before those components become build inputs; they do not eliminate the need to verify later build and artifact handoffs.
6. Integrate secure development across the lifecycle
Use secure-development practices throughout the organization’s software development lifecycle (SDLC), not only at the deployment gate. NIST’s Secure Software Development Framework (SSDF) provides high-level practices that can be integrated into each SDLC implementation and a common vocabulary for software producers, purchasers, and suppliers. It is guidance to integrate with an organization’s delivery model, not a replacement for that model. See NIST SP 800-218, SSDF Version 1.1.
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Standards to use—and how to read their status
These NIST publications address different parts of the problem. Publication status matters: a draft should not be described as a final standard.
| Publication | Role in a CI/CD security program | Status and date |
|---|---|---|
| SP 800-207, Zero Trust Architecture | General, resource-focused zero-trust model | Final; August 2020 |
| SP 800-204D, Strategies for the Integration of Software Supply Chain Security in DevSecOps CI/CD Pipelines | CI/CD-specific supply-chain security strategies, including build, test, package, and deploy stages | Published February 12, 2024 |
| SP 800-218, SSDF Version 1.1 | High-level secure software development practices for integration into an SDLC | Final; February 2022 |
| SP 800-218 Rev. 1, SSDF Version 1.2 | Draft revision of the SSDF | Initial Public Draft dated December 17, 2025; its listed comment period closed January 30, 2026. The cited page identifies it as a draft, not a final publication. |
The listed dates and statuses reflect the cited NIST publication pages. Consult the relevant NIST page when confirming publication status for a later implementation or policy decision.
What a sound implementation should make observable
NIST SP 800-204D frames two central goals for CI/CD supply-chain measures:
- “Actively defend the CI/CD pipeline and build processes.”
- “Ensure the integrity of upstream sources and artifacts (e.g., repositories).”
Use those goals to review whether the implementation covers the whole chain, not just the developer login or final deployment step. The following are useful review questions, not a standardized NIST scoring model:
- Are human, automation, service, and device identities accounted for?
- Are permissions limited by role and pipeline action?
- Are build environments hardened and appropriately isolated?
- Are source, artifact, repository, and build-step checks applied at the relevant handoffs?
- Are third-party components acquired from trustworthy channels and assessed before use?
- Are the checks repeated consistently across stages, with exceptions governed by policy?
The cited NIST publications establish recommended architecture and practices, not a guarantee that any one control will prevent compromise. They also do not establish that a particular CI/CD vendor, identity product, scanner, or registry is approved.
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