The common mistake is treating open source as if it were public domain. Open source software is still governed by license terms, and those terms determine what redistribution, modification, and derivative use are allowed. Teams also overlook dependencies, which means they may unknowingly inherit restrictive obligations through libraries they did not write themselves.
Why Open Source Still Requires Review
Open source is not a blanket permission slip. The license defines what you may do with the code, and different licenses can impose different obligations around attribution, redistribution, modification, and derivative works. Teams also need to verify whether a package is truly original, whether it contains transitive dependencies, and whether those dependencies introduce terms or security exposure the team did not intend to accept.
That matters because “free to use” is often confused with “free of conditions.” In practice, the legal and operational risk comes from assuming the headline license tells the whole story when the actual use case may involve bundling, SaaS distribution, linking, or shipping a product that inherits other components.
Where Teams Misread the License Model
The first mistake is treating open source as if it were public domain. Public domain materials have no enforceable copyright restrictions, but open source software still relies on license grants and license obligations. Those obligations can vary widely, so the question is not whether the code is free, but what the license authorises for your specific distribution model.
The second mistake is looking only at the top-level repository or package and ignoring the dependency tree. A library can be permissively licensed while a nested dependency is not, and that nested dependency can still affect redistribution rights, attribution requirements, or internal approval. This is why software composition review is part of responsible procurement, not just a legal formality.
The third mistake is assuming that open source review is only a legal check. License review and security review often overlap, because the same dependency that creates licensing obligations can also introduce supply chain risk, maintenance uncertainty, or hidden trust on upstream maintainers and package publishers.
What a Proper Review Needs to Cover
A useful review starts with identifying how the software will be used. Internal use, redistribution, SaaS delivery, embedding in a commercial product, and modification can trigger very different obligations. The same package may be acceptable in one scenario and problematic in another, so the decision has to be tied to the actual deployment model rather than a generic “approved” label.
It also needs a dependency inventory that goes beyond direct imports. Transitive libraries, build-time tooling, package-manager behavior, and provenance all matter because the practical risk often sits outside the code a team consciously chose. The strongest review process checks whether the package is current, whether its dependencies are maintained, and whether any license terms are incompatible with the intended use.
For teams that depend heavily on third-party packages, upstream trust is part of the control surface. Open source may reduce procurement cost, but it does not eliminate the need to validate source, ownership, release integrity, and the consequences of pulling in code that could later change hands or be compromised.
Risk and Threat Considerations
The main risk is not that open source exists, but that teams adopt it without understanding the legal and supply chain obligations attached to it. That can create unplanned redistribution duties, forced disclosure concerns, support gaps, or a dependency chain that expands the blast radius of a malicious or compromised package.
Failure mechanism: Teams skip license and dependency review, then ship software under assumptions that do not match the actual license terms or upstream trust chain.
Impact: The result can be legal non-compliance, blocked releases, emergency code removal, or exposure to supply chain compromise through a library the team never directly evaluated.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8 and SLSA set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-15 — Service Provider Management | Open source depends on upstream maintainers and package sources that must be vetted. |
| CIS-16 — Application Software Security | Dependency review and license-aware component control are part of secure software intake. | |
| Recommendation — Assess upstream package sources and maintainers before approving third-party software. Track and review third-party components before integrating them into builds. | ||
| SLSA | Supply chain integrity | Package provenance and dependency integrity materially affect open source adoption risk. |
| Recommendation — Require provenance and integrity checks for sourced software artifacts. | ||
| ISO/IEC 27001:2022 | A.5.19 — Information security in supplier relationships | Open source components create supplier-like dependency risk through upstream projects. |
| A.8.25 — Secure development life cycle | License and dependency review belong in software intake and release governance. | |
| Recommendation — Apply supplier controls to evaluate upstream open source dependencies. Embed dependency review into the secure development lifecycle. | ||
Practitioner Guidance
What to verify: Confirm the exact license for the package and every material transitive dependency, then compare those terms against the intended use, especially redistribution and embedding. If the dependency tree is not inventoried, the review is incomplete.
Decision rule: If the software will leave your control boundary, treat license clearance as a release gate, not an optional legal check. If it stays internal, you still need to assess maintenance, provenance, and dependency risk before you call it “free to use.”
Common mistake: Approving a package because the top-level license looks permissive while ignoring bundled components, build tooling, and later dependency updates that can change the real risk profile.
Practitioner takeaway: Open source is best treated as reusable software with conditions, not as costless software with no review burden.
Related resources from NHI Mgmt Group
- What do teams get wrong when they assume a popular package name means the code is safe to use?
- What do teams get wrong when they assume open source is always cheaper for certificate authority management?
- What do teams get wrong when they assume open source communities will automatically reduce engineering costs?
- What do teams get wrong when they assume new analytics dashboards will preserve existing reporting without rework?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
