The Tool Desk
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That distinction matters more than a ranked list. The available guidance supports six tools in useful detail, not eight equally profiled contenders, so this guide focuses on those six rather than padding the list. OWASP’s DevSecOps guidance, accessed October 7, 2026, identifies CycloneDX 1.7 and SPDX 3.0.x as current standard versions while warning that tools may still emit older versions. Confirm the versions your pipeline’s producers and consumers actually support.
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What an SBOM tool does—and what it does not
A software bill of materials is a machine-readable inventory of software components, their versions, and their relationships. It helps teams identify which products or artifacts may be affected when a dependency has a vulnerability, and supports visibility into software supply chains. An SBOM is not, by itself, a vulnerability assessment or proof that software is secure.
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Tools in this space do different jobs. Generators inspect source inputs, build output, filesystems, or images and produce an SBOM. Management platforms ingest those files to track inventory, vulnerabilities, and policy over time. Aggregation systems bring SBOMs and other supply-chain evidence together for queries. A team may use one tool from each category.
Which free SBOM tool fits your task?
| Tool | Primary role | Useful fit | Important distinction |
|---|---|---|---|
| Syft | SBOM generation | Inventorying container images, filesystems, and directories | Generation is not ongoing portfolio monitoring. |
| Trivy | SBOM generation and security scanning | Teams checking source, containers, virtual machines, Kubernetes, or infrastructure as code | Verify current project guidance and required scanning behavior for your deployment. |
| cdxgen | CycloneDX generation | Generating CycloneDX SBOMs across multiple ecosystems | Choose it when CycloneDX output fits the receiving workflow; no universal superiority is established. |
| Microsoft SBOM Tool | SPDX generation | Build-output and package-manifest workflows, including CI and large builds | It may not fit a requirement for direct container-image scanning or native CycloneDX output. |
| OWASP Dependency-Track | SBOM ingestion and lifecycle management | Maintaining inventory, vulnerability visibility, and policy across submitted SBOMs | It manages SBOMs; it does not replace selecting and running a generator. |
| GUAC | Supply-chain data aggregation and querying | Combining SBOM, provenance, and scorecard data in a queryable graph | It is an aggregation and query layer, not a simple SBOM generator. |
Syft: broad inventory generation
OWASP describes Syft as generating SBOMs from container images, filesystems, and directories. It can be useful when a team needs to inspect built artifacts as well as files on disk. A January 2026 comparison reports CycloneDX, SPDX 2.3, and Syft JSON output, along with broad package-ecosystem support; treat those specifics as comparison guidance, not an independent benchmark. Syft is paired with Grype in an SBOM-first software composition analysis workflow, but that does not turn Syft itself into a continuous portfolio-monitoring platform. Check its coverage against your own images and build types. OWASP’s SBOM guidance and the January 2026 comparison describe these capabilities.
Trivy: generation alongside scanning
OWASP says Trivy can produce and scan SBOMs in SPDX and CycloneDX. The January 2026 comparison also describes use with source, container, virtual-machine, Kubernetes, and infrastructure-as-code targets. This combination may suit teams that want SBOM generation in a broader security-scanning workflow. Confirm the current project documentation for the exact targets, formats, and behavior you plan to rely on; those details can change. Neither the broad target list nor format support establishes that every dependency in every project will be found.
Rank #2
cdxgen: a CycloneDX-focused generator
OWASP lists cdxgen as a multi-ecosystem CycloneDX generator and includes a Java command example in its guidance. It is a reasonable candidate when CycloneDX is the required output and your ecosystem is supported. The sources do not establish that it is more accurate or complete than other generators, so compare results on representative projects rather than treating a “best” label as a measured ranking.
Microsoft SBOM Tool: build-oriented SPDX output
OWASP describes Microsoft SBOM Tool as generating SPDX SBOMs from build output and package manifests, with CI and large builds in mind. The comparison source identifies SPDX as its output. This can align well with a build pipeline that standardizes on SPDX, but the cited material does not support treating it as a direct container-image scanner or as a native CycloneDX producer. If a receiving system requires CycloneDX, verify whether a compatible conversion path preserves the fields your workflow needs.
Rank #3
Dependency-Track: inventory and monitoring after generation
OWASP Dependency-Track is a free, open-source platform for inventory, vulnerability visibility, and policy management. It operates natively with CycloneDX and can be deployed with Docker Compose. Feed it SBOMs produced by an appropriate generator; it is not a substitute for generating an inventory of the relevant source, image, or build output. The project site says a move from version 4.x to version 5 is not an in-place upgrade, so teams planning that migration should review the project’s current migration instructions before changing deployments.
Its site, accessed October 7, 2026, reports use by 20,000+ organizations in production, one instance processing 20,000+ SBOMs per hour, another instance with more than 1 million SBOMs, and 5 billion+ components tracked globally. These are figures published by the project site, not independently verified measurements or guarantees of performance for a particular deployment.
Rank #4
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GUAC: query across supply-chain evidence
OWASP describes GUAC as aggregating SBOM, provenance, and scorecard data into a queryable graph. That makes it a different kind of choice from a generator: it is relevant when the challenge is connecting and querying supply-chain evidence across sources, rather than producing a single SBOM for one artifact. The cited guidance does not characterize GUAC as a drop-in vulnerability-monitoring platform or a simple generator.
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Before adopting a tool, identify what the pipeline must inspect and what the next system must consume. A tool that can inventory a container may not cover the source manifests or build outputs that matter to your team, and a well-formed SBOM is still inconvenient if its format or version is rejected downstream.
- Inventory target: Decide whether you need source and lock files, build output, a directory or filesystem, a container image, or several layers. For containerized software, consider both operating-system and application packages, then validate the final artifact.
- Ecosystem: Test with representative projects in each language and package-manager stack you deploy. Broad ecosystem claims do not guarantee equal coverage of every dependency type.
- Format and version: Agree on CycloneDX or SPDX—and a specific version—with every producer and consumer. OWASP’s guidance, accessed October 7, 2026, calls out CycloneDX 1.7 and SPDX 3.0.x as current, while noting that tools may still emit CycloneDX 1.5/1.6 or SPDX 2.3. Do not assume that a tool emits the newest version simply because it supports the standard.
- Analysis depth: Check what the tool discovers from manifests versus built images or filesystems, and inspect whether important dependency relationships and identifiers appear in its output.
- Pipeline role: Choose a generator for producing inventories, a management platform for continuous inventory and monitoring, or an aggregation layer for querying evidence. Combining categories is normal when those are distinct needs.
- CI/CD fit: Confirm the generation step can run at the point where resolved dependencies and build outputs are available, and that the resulting SBOM can be attached to or retained alongside the artifact.
- Compatibility and conversion: Test ingestion by the actual downstream consumer. OWASP warns that format conversion can lose data, so a conversion step should be validated rather than assumed harmless.
Build a dependable SBOM workflow
- Generate during the build. Create the SBOM when dependencies have been resolved, rather than reconstructing it later. This improves the link between the inventory and the artifact produced by that build. OWASP recommends generating during the build. See its build-time guidance.
- Cover the relevant layers. Decide whether source or lock-file dependencies, the container’s operating-system and application packages, and the final artifact each need coverage. One scan target should not be mistaken for complete visibility across all layers.
- Check the output. Confirm the format and version, then inspect representative SBOMs for the fields and dependency relationships your consumers rely on. Current guidance points readers to CISA for authoritative content requirements because field requirements have been revised over time. OWASP’s checklist includes component name and version, supplier or origin, identifiers such as CPE or PURL (with PURL preferred), hashes, license information, relationships, author and timestamp, format version, tool, and generation method; treat it as useful guidance, not a permanent legal checklist. OWASP links to the relevant CISA guidance.
- Test the consumer. Submit output to the platform or process that will use it. Verify that it accepts the standard and version and retains the information your workflow needs, especially if conversion is involved.
- Keep the SBOM with the artifact. Version and retain the SBOM alongside the corresponding release artifact. OWASP demonstrates attaching it as an attestation with cosign and referencing an image digest, which helps bind the inventory to a specific image rather than an ambiguous tag.
- Automate and monitor where needed. Run generation in CI/CD. If the requirement includes continuous inventory, vulnerability monitoring, or policy checks, ingest the generated SBOMs into a management platform such as Dependency-Track rather than expecting a generator alone to provide those functions.
- Evaluate with your own projects. Compare candidate tools on representative repositories and images in your stack. The January 2026 comparison recommends evaluating completeness on one’s own projects; the available material does not provide independent head-to-head test results or a universal accuracy ranking. Read the comparison guidance.
What SBOM metrics can—and cannot—tell you
OWASP’s DevSecOps guidance sets operational targets including attaching SBOMs to 100% of release artifacts, using a machine-readable standard format for 100%, identifying affected artifacts in under one hour through automated monitoring, assigning VEX status to more than 80% of high- or critical-severity CVEs, and keeping SBOM age below 24 hours at release. These are guidance targets, not observed outcomes, legal requirements for every team, or performance guarantees for a particular tool. Use them as prompts for defining your own process measurements, not as evidence that buying or deploying a tool automatically meets them. OWASP DevSecOps Guideline
Regulatory timing: scope matters
OWASP’s guidance says that the EU Cyber Resilience Act’s vulnerability-reporting duties apply from September 11, 2026, and machine-readable SBOM documentation from December 11, 2027; it also says the CRA does not mandate a particular SBOM format. These dates and duties concern the regulation’s applicable products and operators, not every software project by default. Treat this as a high-level summary, not legal advice, and consult the official legal text for scope and obligations that apply to a specific product or organization. OWASP’s guidance provides the summary.
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