A Runtime Bill of Materials is a live inventory of the software components, packages, and dependencies active in a running application or workload. It helps identify what is actually deployed, not just what was built. In security operations, it supports vulnerability response, software provenance checks, and NHI governance for exposed runtimes.
What a Runtime Bill of Materials tells you
A runtime bill of materials is the inventory that answers a practical security question: what components are actually loaded, linked, and executing right now. That makes it more operationally useful than a build-time list when you are validating exposure, provenance, or what a live workload really depends on.
It is especially valuable when deployments drift from the artifact that was originally approved. A running service may contain transitive libraries, injected agents, sidecar components, or image layers that never appear in a source repository snapshot, so the runtime view becomes the authoritative evidence of what defenders must assess.
Why runtime inventory matters for security operations
Security teams use this inventory to narrow the gap between package intelligence and live exposure. If a vulnerable component is present in memory or on disk in an active workload, the question is not only whether it exists in the supply chain, but whether it is actually reachable in production and therefore worth prioritising.
A runtime BOM also helps distinguish installed software from software that is meaningfully active. That distinction matters because dormant dependencies, disabled features, and bundled but unused libraries often create noise in response workflows. A runtime view supports more accurate triage when the goal is to confirm real exposure rather than theoretical presence.
For containerised and service-based systems, the runtime layer is where configuration, orchestration, and trust boundaries meet. NIST SP 800-190 Container Security is a useful reference point for understanding why container image content, registry provenance, orchestrator state, and runtime behaviour all matter together.
How runtime BOMs support provenance and dependency verification
A runtime BOM is not just a dependency list. It is evidence that can be compared against source manifests, package metadata, signed artifacts, and approved deployment records to detect drift, shadow additions, or tampering. That comparison is what makes the inventory useful for provenance checks in security operations.
The most practical use is correlation. Teams can compare what was expected to be deployed with what is executing, then decide whether an unexpected module, package, or dependency is benign, misconfigured, or suspicious. In mature environments, that comparison also supports incident response when an attacker has modified a live workload after deployment.
When runtime analysis is paired with software composition data, organisations get a better answer to the question “is this vulnerable component actually in the path of execution?” The SBOM Guide is the natural companion for understanding the build-time side of that relationship, while a runtime BOM closes the loop at execution time.
Identity and secret exposure in live workloads
Runtime inventories are increasingly relevant to identity governance because live software often carries the credentials, tokens, certificates, and service bindings it needs to operate. If a workload exposes those materials at runtime, defenders need to know not just that the component exists, but what it can authenticate to and what it can reach.
That is why a runtime BOM can help surface identity-bearing dependencies that matter to non-human access paths. It can reveal which components are capable of using secrets or invoking downstream services, which is important when reviewing overprivilege, secret sprawl, or unintended reuse across environments.
AI Security Posture Management (AI-SPM) Guide is relevant here because it treats AI workloads as live operating environments with assets, identities, and attack paths that must be discovered and governed in runtime, not only at build time.
What good runtime inventory enables after deployment
Once teams have a trustworthy runtime BOM, they can use it to drive faster exposure analysis, better change detection, and stronger post-deployment assurance. It becomes a living reference for vulnerability response, integrity review, and determining whether a compromise changed the active software set.
In practice, the value is in continuous comparison, not one-time documentation. A runtime BOM should support monitoring for unexpected component additions, dependency swaps, and unsupported software drift so that defenders can act while the affected workload is still live.
For teams that build their own software, the runtime view should complement broader supply-chain and build-integrity work. SLSA helps establish build and provenance expectations, while runtime inventory helps confirm whether the deployed system still matches those expectations in operation.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | Runtime BOMs materially support authoritative inventory of active components and dependencies. |
| SI-2 — Flaw Remediation | Runtime BOMs help identify where vulnerable active components require remediation prioritisation. | |
| SA-12 — Supply Chain Protection | Runtime BOMs strengthen provenance checks by comparing deployed software against trusted supply-chain records. | |
| Recommendation — Maintain a live component inventory and reconcile it against the runtime BOM to detect drift and exposure. Use the runtime BOM to prioritise flaw remediation for components that are actually executing in production. Compare runtime components with supply-chain evidence to confirm deployed software provenance. | ||
| CIS Controls v8 | CIS-2 — Inventory and Control of Software Assets | A runtime BOM is a live software-asset inventory that extends asset control into execution. |
| Recommendation — Inventory active software assets continuously and reconcile them against approved deployment records. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Runtime dependency visibility supports secure architecture and trustworthy deployment assumptions. |
| Recommendation — Verify that deployed runtime dependencies match the architecture and security assumptions used in design. | ||
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Reviewed and updated by the NHIMG editorial team on October 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org