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Supply chain security means managing the trust, access, and changes that connect suppliers and infrastructure to source code, software builds, applications, and cloud operations. An SBOM helps identify software components, but it cannot establish that a supplier, build system, cloud identity, or physical device is secure. Effective protection combines controls at each lifecycle stage with clear ownership between suppliers and customers.
What supply chain security covers
A technology supply chain is the set of outside and internal parties, components, services, and processes that contribute to a system. For software, that can include a vendor, open-source packages, code repositories, build infrastructure, release processes, and the cloud services where an application runs. The wider infrastructure picture may also include hardware and operational technology, but a software bill of materials does not describe every such dependency.
Compromise can arise from a design flaw or vulnerable third-party component, malicious code introduced into a supplier’s development process, or software altered during build or delivery before a customer deploys it. When an affected package or supplier serves many customers, one compromise can reach many environments. CISA’s customer guidance describes these threats and the shared responsibilities involved in acquiring, deploying, and operating software.
Use a lifecycle view: identify who controls each dependency, what could be changed or compromised at that stage, what evidence can reveal it, and who must act when risk is found.
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How responsibilities and controls change across the lifecycle
| Stage | Typical owner | Useful controls and evidence |
|---|---|---|
| Acquire and govern | Customer and supplier | Document supplier relationships, security assumptions, requirements, ownership, support, and relevant changes. |
| Develop and protect | Supplier or internal development team | Restrict access to code, packages, build systems, and development identities; use least privilege and protect against unauthorized changes. |
| Build, release, and verify | Supplier or internal release team; customer verifies what it receives | Connect source and build processes to released artifacts; use secure hashes and provenance where applicable; verify artifacts against expectations. |
| Deploy, operate, and respond | Customer and supplier, with cloud provider responsibilities depending on the service | Track software components, monitor vulnerabilities, maintain updates, and coordinate incident response across organizational boundaries. |
The controls are not interchangeable: a component inventory helps answer what is present, while access controls reduce who can alter it, provenance records how an artifact was produced, and verification checks whether the received artifact matches expectations. CISA’s supplier recommendations cover code access, least privilege, binary validation using secure hashes, and secure update and patch processes.
Acquire and govern suppliers before relying on their software
Supplier review is not a one-time questionnaire. Record the relationship, the supplier’s role, security assumptions, contractual requirements, support expectations, and which party owns updates and incident communication. Revisit that record when ownership or location changes, or when the product’s functionality or support changes. Those changes can alter who has access, where data is handled, or whether the customer can still obtain security fixes.
Customers and suppliers have distinct responsibilities, but some safeguards require coordination. A customer can set requirements and manage deployment; a supplier controls much of its development and release process. Neither should assume the other has handled every risk. CISA’s customer guidance lays out activities across acquisition, deployment, and operations.
Protect source code, dependencies, and development access
Open-source software is part of many supply chains, so dependency management should be an ongoing engineering practice rather than a one-off scan. Maintain visibility into packages in use, assess vulnerabilities, and have a process to update or replace affected components. Use controlled internal repositories where appropriate so teams can manage which packages are approved and available.
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An SBOM, or software bill of materials, is an inventory of software components. It helps teams understand what a product contains and identify whether a component of concern is present. It is not proof that the listed components are safe, that the list is complete, or that the software was built securely. CISA’s guidance treats open-source dependency management, repository practices, maintenance, vulnerability response, and SBOM creation and validation as related lifecycle activities.
Protect the systems and identities that can change code or packages. Apply least privilege, limit access to what a person or automated process needs, and guard against unauthorized modification. These controls matter for internal development as well as supplier environments: a trustworthy component inventory cannot prevent an attacker with code or build access from changing what is shipped.
Build, release, and verify artifacts
Build integrity depends on being able to connect a delivered artifact to the process that produced it. A cryptographic hash can help validate that a binary matches a known value, while provenance records can provide evidence about an artifact’s origin and production. Verification is the step that checks evidence and artifacts against expectations; simply generating a record does not establish that the process was trustworthy.
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SLSA organizes improvement incrementally and addresses artifact production, provenance distribution, and verification. The SLSA v1.1 specification page identifies v1.1 as retired and v1.2 as current, so teams should consult the current specification before implementing requirements. Treat the framework as a way to reason about build evidence and verification, not as a substitute for managing dependencies, supplier access, or vulnerabilities.
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Carry supply chain controls into cloud operations
Cloud services extend the chain beyond application code: identity systems, tokens, keys, logs, third-party dependencies, and governance all affect how services are accessed and operated. In a July 15, 2025 article, CISA highlighted these concerns in the context of cloud identity infrastructure. That makes cloud identity and operations part of supply chain security, not a separate afterthought.
Map responsibilities to the specific service and deployment. A customer may control application configuration and user access while a provider operates underlying services; the exact division depends on the arrangement. Ensure logging and key management are addressed, understand how tokens authenticate services, and know how supplier or cloud-provider changes are communicated. The central question is what evidence each party can provide and who responds when it shows a problem.
Where software supply chain guidance stops
The controls above are strongest for software, suppliers, and cloud services. They should not be mistaken for a complete framework for physical hardware or operational technology. Those environments have distinct sourcing, maintenance, and operational concerns; an SBOM alone cannot inventory or validate them. Organizations with those exposures should extend their risk model to cover the relevant infrastructure and suppliers rather than treating software evidence as a full-system assurance.
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