An open source software policy sets the rules for how an organisation may approve, use, modify, and distribute open source code. It typically defines review, licensing, security, and ownership controls, plus obligations for vulnerability tracking, dependency management, and permitted use across applications, cloud services, and development pipelines.
What an open source software policy covers
An open source software policy is the organisation’s rulebook for approving, using, modifying, and distributing open source code. It defines who can make decisions, what evidence is required, and which legal and security checks must happen before code enters products or pipelines.
Because the policy sits between engineering freedom and organisational control, it usually covers dependency intake, licence review, security review, ownership, and exception handling. In practice, it tells teams when a component is acceptable, when it needs remediation, and when it must be rejected or isolated.
Why the policy exists in the software lifecycle
The policy gives organisations a consistent way to manage open source across source code, build systems, cloud services, and deployed applications. Without it, teams tend to make local decisions that create inconsistent licence exposure, uneven review standards, and blind spots in the software supply chain.
It also creates a durable ownership model. Open source use is not only a developer preference; it is a governed decision about what enters the estate, how changes are tracked, and who is accountable when a package becomes risky, unsupported, or non-compliant.
Security, licensing, and dependency control
Security and licence controls are the core technical reason this policy matters. Open source can be trustworthy and efficient, but it can also introduce malicious packages, dependency confusion, transitive risk, and hidden secrets if teams rely on it without review. NHIMG’s Open Source Security Guide and Malicious Package and Dependency Confusion Guide are useful references for the controls that sit behind those decisions.
Licence obligations are just as important as technical risk. A policy should define which licences are allowed, which require legal review, and how obligations are recorded so that downstream distribution does not accidentally violate copyleft or attribution requirements. For that reason, many organisations pair the policy with a formal licence compliance process such as NHIMG’s Open Source Licence Compliance Guide.
Dependency governance is where the policy becomes operational. Teams need rules for pinning, update cadence, vulnerability monitoring, SBOM use, and when a package may be blocked, forked, or replaced. A strong policy treats these as routine engineering controls, not as ad hoc exceptions after something breaks.
Ownership, exceptions, and lifecycle governance
A useful policy makes ownership explicit. Someone must approve exceptions, someone must maintain approved-package lists, and someone must decide when a package is abandoned, vulnerable, or no longer supported. That governance is what prevents open source from becoming an unmanaged “everyone can use it” category.
It should also define what happens after approval. That includes re-review triggers, periodic attestations, emergency revocation, and the handling of upstream changes that alter risk. For mature programmes, this is often tied to broader compliance automation and control monitoring so that policy intent stays aligned with actual usage.
Because open source crosses development, operations, and procurement, the policy is most effective when it is treated as a lifecycle control, not a document that only legal or security teams read once. It should be usable by developers, platform teams, and reviewers at the point where a dependency or repository decision is made.
Where to align policy with authoritative control frameworks
Open source software policy usually maps cleanly to supply-chain and secure-development controls, because it governs approved components, provenance, vulnerability handling, and release discipline. Organisations often anchor these requirements in supply-chain and application-security programmes rather than leaving them as informal engineering norms.
A practical policy should be written so it can support audit, enforcement, and tooling, not just policy language. That means the rules need to be specific enough for scanners, repository controls, approval workflows, and exception tracking to enforce them consistently across the delivery pipeline.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, OWASP ASVS and SLSA set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-16 — Application Software Security | Open source policy governs approved components and secure software intake. |
| CIS-15 — Service Provider Management | Open source policy often governs third-party packages and upstream maintainers. | |
| Recommendation — Enforce software approval and review controls for all open source components before release. Track third-party component risk and review upstream trust before adoption. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | The policy shapes how approved libraries and dependencies are selected and governed. |
| Recommendation — Require dependency review and secure architecture checks before open source adoption. | ||
| SLSA | Supply Chain Levels for Software Artifacts | Open source policy depends on provenance, build integrity and supply-chain assurance. |
| Recommendation — Adopt provenance and build-integrity requirements for approved open source dependencies. | ||
| ISO/IEC 27001:2022 | A.8.25 — Secure development life cycle | The policy governs how open source enters and changes within development workflows. |
| Recommendation — Embed open source approval and review into the secure development lifecycle. | ||
Related resources from NHI Mgmt Group
- Why do transitive dependencies create unexpected open-source license risk in modern software?
- Why do open source dependencies complicate secure software delivery?
- How should security teams account for generative AI when evaluating open source software and code generation workflows?
- Why does a software bill of materials matter when organisations rely on third-party code and open source libraries?