Category: Supply Chain Risk Management

Software Composition Analysis

Also known as:

Simply put

Software Composition Analysis (SCA) is an automated process that identifies the software components, especially open source components, used within an application. It helps organizations understand what building blocks make up their software so they can spot known security vulnerabilities and licensing concerns in those components.

Formal definition

Software Composition Analysis (SCA) is a cybersecurity technique that automatically inventories and analyzes the components within a codebase or application, most commonly open source packages and their dependencies. It generally examines these components to identify known vulnerabilities and to evaluate associated software licenses. SCA is typically applied to open source software; the depth of analysis and the specific findings surfaced vary by tool and implementation, and readers should confirm scope and coverage against the applicable product documentation.

Why it matters

Modern applications are rarely written entirely from scratch. They are assembled from open source packages and their transitive dependencies, meaning that a large portion of any given application's codebase originates from third parties. Software Composition Analysis matters because organizations cannot secure or govern components they cannot see. Without an automated inventory of what open source software is present, a security team has limited ability to determine whether a newly disclosed vulnerability affects their applications or whether a dependency carries a license that conflicts with the organization's obligations.

For defense and public sector environments, this visibility supports broader supply chain risk management objectives. Frameworks such as the NIST Risk Management Framework and requirements for protecting Controlled Unclassified Information generally expect organizations to identify vulnerabilities in the software they operate; SCA is one technique that can help surface known vulnerabilities in open source components as part of that effort. It is important to note, however, that SCA is not a complete security program, identifying a component and its known vulnerabilities is distinct from remediating them, and compliance with an SCA-related control does not by itself equate to a secure system. Readers should confirm how any specific tool's scope maps to their applicable authorization and continuous monitoring requirements.

Who it's relevant to

Application Security and Development Teams

Teams building or maintaining applications assembled from open source components use SCA to inventory those components and to identify known vulnerabilities and licensing concerns before and after release. This visibility informs remediation decisions, though identifying an issue is only the first step and does not by itself resolve the underlying risk.

Information System Security Managers and Security Analysts

Personnel responsible for monitoring the security posture of systems can use SCA output as one input into vulnerability identification and continuous monitoring activities. They should treat SCA findings as one component of a broader assessment rather than as a comprehensive measure of application security.

Government Contractors and Suppliers

Organizations delivering software to defense and public sector customers may rely on SCA to understand the open source composition of their deliverables and to surface known vulnerabilities and license obligations. Contractors should verify how SCA use maps to their specific contractual and framework requirements, which SCA alone does not establish.

Compliance Officers and Auditors

Those evaluating whether an organization has adequate visibility into its software supply chain may consider SCA as evidence of component inventory and vulnerability identification practices. Auditors should confirm the tool's actual coverage against product documentation and against the applicable control requirements rather than assuming any single tool satisfies a given obligation.

Inside SCA

Component and Dependency Inventory

SCA tools identify the open source and third-party components incorporated into an application, including transitive dependencies that are pulled in indirectly. This inventory generally forms the basis for a Software Bill of Materials (SBOM), though readers should confirm the specific SBOM format and completeness against their organizational or contractual requirements.

Known Vulnerability Identification

SCA correlates identified components and their versions against vulnerability data sources to flag components with publicly known weaknesses. The completeness and timeliness of results depend on the underlying data sources and how frequently they are updated, so findings should be treated as indicative rather than exhaustive.

License and Compliance Analysis

Many SCA implementations evaluate the open source licenses associated with detected components to help organizations understand obligations and potential conflicts. This addresses legal and licensing risk, which is distinct from security vulnerability risk, and specific license interpretations should be confirmed with appropriate counsel.

Integration into the Development Pipeline

SCA is commonly integrated into build systems, source repositories, and CI/CD pipelines so that composition and vulnerability checks run as part of routine development activity. The degree of automation and enforcement varies by implementation and organizational policy.

Common questions

Answers to the questions practitioners most commonly ask about SCA.

Does running Software Composition Analysis mean my software is secure or compliant?

No. SCA identifies and inventories open-source and third-party components and flags known vulnerabilities and license issues in those dependencies, but it does not by itself establish that a system is secure or that it satisfies a control baseline. SCA is one input among many; compliance generally requires evidence that the relevant controls (for example, those addressing vulnerability management, configuration management, and supply chain risk under an applicable framework such as NIST SP 800-53) are implemented, assessed, and authorized. Treating an SCA scan as proof of security or compliance is a common mistake an assessor would correct. Verify how SCA findings map to your specific control obligations against current authoritative sources.

Isn't SCA the same thing as Static Application Security Testing (SAST)?

No, they address different scopes. SCA focuses on identifying third-party and open-source components and their known vulnerabilities and licenses, whereas SAST analyzes an application's own source or bytecode for coding weaknesses. They are complementary rather than interchangeable, and relying on one does not cover the other. Confirm which testing types your program requires, as this can vary by agency tailoring and by the impact level or system category involved.

Where does SCA typically fit within a development pipeline?

In most implementations, SCA is integrated into the software development lifecycle so that component inventories and vulnerability findings are generated during build or continuous integration stages, and often as a gate before release. Placement and enforcement thresholds are organization- and program-specific, so confirm the required integration points against your governing policies and any applicable contractual or agency guidance.

How does SCA relate to producing a Software Bill of Materials (SBOM)?

SCA tools commonly generate or contribute to an SBOM by enumerating the components and dependencies present in a software product. The component inventory produced by SCA can support SBOM requirements, but the exact SBOM format, contents, and delivery expectations depend on the applicable policy or contract. Verify the specific SBOM requirements and accepted formats that apply to your engagement against current official sources.

How should SCA findings be prioritized and remediated?

Prioritization generally considers factors such as vulnerability severity, exploitability, whether the affected component is actually used, and the availability of updates or mitigations. Organizations typically remediate through updating, patching, replacing, or documenting an accepted risk for affected components, consistent with their vulnerability management and risk acceptance processes. Because remediation timelines and acceptable-risk procedures are set by organizational policy and may be shaped by agency tailoring, confirm the specific requirements that apply to your system.

Is a one-time SCA scan sufficient, or does it need to be ongoing?

A single scan reflects only a point in time. Because new vulnerabilities in existing components are disclosed continuously and dependencies change, SCA is generally treated as a recurring activity that supports ongoing monitoring rather than a one-time check. This aligns with the principle that authorization decisions are time-bound and subject to continuous monitoring. Confirm the cadence and evidence retention expectations required by your applicable policies and authorization requirements.

Common misconceptions

SCA is the same as static application security testing (SAST).

SCA and SAST address different concerns. SCA generally focuses on identifying third-party and open source components and their known vulnerabilities and licenses, while SAST analyzes an organization's own source code for security weaknesses. They are complementary rather than interchangeable.

A clean SCA scan means the software is secure.

SCA results reflect known vulnerabilities in identified components as of the data sources used, and do not account for undisclosed vulnerabilities, custom code flaws, misconfiguration, or newly published issues. Compliance with an SCA-based check is not equivalent to overall security, and continuous monitoring remains necessary.

An SCA-generated SBOM fully satisfies any applicable federal or defense software supply chain requirement.

While SCA can support SBOM generation, whether a given output meets a specific requirement depends on the applicable format, content, and authority governing that requirement. Readers should verify current authoritative guidance and any contractual terms rather than assuming automatic satisfaction.

Best practices

Run SCA automatically within CI/CD pipelines and build processes so component and vulnerability checks occur consistently rather than as one-time manual efforts.

Maintain and regularly update the component inventory, including transitive dependencies, and use it as a basis for SBOM generation aligned to your applicable requirements.

Treat SCA as one layer among several, pairing it with practices such as source code analysis and configuration review, since a clean SCA result does not by itself establish security.

Verify that the underlying vulnerability data sources are current, and periodically re-scan existing components because new vulnerabilities may be disclosed after initial assessment.

Review both security findings and license findings, routing licensing questions to appropriate legal or compliance stakeholders for interpretation.

Confirm any SBOM format, content, and reporting output against current authoritative guidance and applicable contractual terms before relying on it to demonstrate compliance.