Why does a software bill of materials matter when organisations rely on third-party code and open source libraries?

An SBOM matters because it turns opaque software dependencies into an auditable inventory. That visibility helps teams identify vulnerable libraries, trace component ownership, track updates, and spot abandoned packages before they become a security or availability problem. Without that baseline, patching and risk decisions are slower and less reliable.

Why This Matters for Security Teams

When organisations depend on third-party code and open source libraries, the risk is rarely limited to one vulnerable package. The real problem is that dependencies create a moving trust boundary: code can be updated, swapped, abandoned, or compromised without a clear operational signal. A software bill of materials gives teams the inventory needed to map what is actually running, which versions are present, and where exposure exists.

That visibility matters because modern software supply chain incidents often start with a package that looks routine until it is abused. NHIMG research on the PyPI Breach and the Nx Package Attack — 2,300+ Credentials Leaked shows how quickly dependency abuse can turn into credential exposure and downstream compromise. The OWASP guidance in the OWASP Non-Human Identity Top 10 also reinforces that identity and supply chain risk are tightly linked when software automation relies on secrets, tokens, and service accounts.

In practice, many security teams discover dependency risk only after a vulnerable library has already been deployed, rather than through intentional software inventory discipline.

How It Works in Practice

An SBOM is useful only when it is treated as an operational control, not a compliance artifact. In practice, teams need the SBOM to be generated early, updated continuously, and tied to vulnerability intelligence so it can answer three questions fast: what component is affected, where is it used, and what business system depends on it. NIST’s NIST SP 800-53 Rev 5 Security and Privacy Controls supports this kind of traceability through supply chain and configuration management expectations, while the NIST SP 800-63 Digital Identity Guidelines help frame why software identity, provenance, and authentication signals matter when components interact with sensitive systems.

For security and platform teams, the practical workflow usually looks like this:

• Generate an SBOM at build time and refresh it when dependencies change.
• Correlate SBOM entries with vulnerability feeds, package maintainer status, and exploit intelligence.
• Identify direct and transitive dependencies, since the risk is often buried several layers deep.
• Use the SBOM to prioritise patching by asset criticality, not by CVE count alone.
• Feed the inventory into incident response so affected applications can be found quickly.

NHIMG data shows why this discipline matters: 96% of organisations store secrets outside secrets managers in vulnerable locations, and 79% have experienced secrets leaks. That means a compromised dependency can become more than a code issue if it exposes tokens, API keys, or automation credentials. The SBOM does not remove risk on its own, but it turns unknown dependency exposure into something that can be measured and managed. These controls tend to break down in fast-moving CI/CD environments where packages are frequently updated without synchronised inventory refresh, because the SBOM goes stale faster than the release pipeline.

Common Variations and Edge Cases

Tighter SBOM requirements often increase build and review overhead, requiring organisations to balance faster delivery against better dependency assurance. That tradeoff becomes sharper in polyglot environments, where different package managers, container layers, and generated artifacts each need coverage. Best practice is evolving here, and there is no universal standard for how complete an SBOM must be to be operationally useful.

Some teams focus only on top-level dependencies, but that misses transitive packages, which are often where the most serious exposure hides. Others assume an SBOM alone is enough for supply chain defence, when in reality it must sit alongside signed provenance, secure dependency policy, and secrets hygiene. The 52 NHI Breaches Analysis is a useful reminder that software supply chain failures frequently spill into identity compromise, especially when tokens, service accounts, or API keys are embedded in build and runtime paths. For that reason, SBOM adoption should be paired with rotation, revocation, and package trust review rather than treated as a standalone control.

Where SBOMs are least effective is in generated code, ephemeral dependencies, and unmanaged internal packages, because the inventory may not reflect what was actually executed in production.

Related resources from NHI Mgmt Group

• Why do SBOMs matter when cloud providers rely on third-party software?
• What breaks when third-party credentials are published in source code?
• Why do access logs matter more when organisations rely on third parties and hybrid systems?
• How should organisations secure payment pages that rely on third-party JavaScript?