Software Bill of Materials (SBOM)

A Software Bill of Materials (SBOM) is a structured, machine-readable list of all software components that make up an application, firmware, or system. It typically includes proprietary code, open-source libraries, third-party components, and their dependencies, along with identifying information such as version, supplier, and known reference identifiers.

What an SBOM includes

In an industrial or manufacturing context, an SBOM commonly describes the software stack for:

• Manufacturing execution systems (MES), ERP integrations, and plant-floor applications
• OT equipment firmware (PLCs, HMIs, CNC controllers, test stands, industrial PCs)
• Quality, traceability, and data collection tools deployed on the shop floor

An SBOM usually contains:

• A list of components (name, version, and supplier or origin)
• Relationships between components (for example, dependency trees)
• Identifiers for components (such as package URLs or other catalog IDs)
• Document metadata (author, date, and tooling used to generate the SBOM)

What an SBOM is not

• It is not the same as a hardware Bill of Materials (BOM) used for physical parts.
• It is not a complete cybersecurity program or vulnerability management system.
• It is not a guarantee of compliance, security, or safety.

Instead, an SBOM provides transparency about what software is present so that organizations can perform their own risk, vulnerability, and compliance assessments.

Operational use in regulated manufacturing

In regulated industrial environments, SBOMs are used to support:

• Cybersecurity and regulatory alignment: mapping known vulnerabilities to specific software components in MES, QMS, and OT systems.
• Change and configuration management: documenting software baselines for validated systems and tracking changes between releases.
• Supplier management: requesting SBOMs from software vendors and OEMs to understand third-party and open-source content.
• Incident response: rapidly identifying where a vulnerable library or component is deployed across plants, lines, or assets.
• Compliance documentation: providing evidence of software transparency as part of broader quality, IT, or cybersecurity audits.

SBOMs can be stored alongside other system documentation, referenced in configuration records, or integrated into automated tooling that checks components against vulnerability databases.

Formats and standards context

SBOMs are typically encoded in standardized formats that support automation and interoperability across tools. Common examples include formats that provide structured component lists, relationships, and metadata. In manufacturing, these formats are often integrated with IT service management, asset management, and OT configuration management databases.

Common confusion

• SBOM vs. hardware BOM: A hardware BOM lists physical parts and materials. An SBOM lists software components and dependencies. Many industrial systems require both.
• SBOM vs. vulnerability report: An SBOM is an inventory. Vulnerability reports and security scans use the SBOM as input but are separate documents or tools.
• SBOM vs. configuration specification: Configuration documents describe how a system is set up (parameters, options). An SBOM describes what software components are present.

Relation to cybersecurity and compliance

For organizations aligning with cybersecurity and defense-related requirements in manufacturing, SBOMs are increasingly referenced as part of secure software development, supply chain risk management, and asset inventory practices. They support internal controls around software provenance, patch management, and documentation expected in many regulated environments, without by themselves proving compliance.