An SBOM hub is a central place where a producer stores its SBOMs, per product and release, and lets customers find and download them with the right access. It is one answer to the sharing problem. CISA's guidance describes author, distributor and consumer roles, and several ways to share.
Why does sharing need a design?
Generating an SBOM is half the job. Customers must find the right file for the right version, trust that it is current, and have permission to read it. Emailing a file works for the first customer and fails at the fiftieth.
CISA's SBOM Sharing Lifecycle Report aims to describe the parties and phases of sharing and to help readers pick solutions that match their time, skills and tooling. CISA's roles document defines three roles: SBOM author, SBOM consumer and SBOM distributor. A hub typically plays the distributor role on behalf of an author.
What should a hub do?
Index by product and version. A customer should reach the SBOM for the exact release they run.
Control access. Some SBOMs are public. Others are shared under NDA or only to named customers.
Stay current. A new release produces a new SBOM. Old ones stay available with their dates.
Carry exploitability. CISA describes VEX as a way for a supplier to say whether a product is affected by a given vulnerability, and its materials explain when to issue VEX information. A hub can publish VEX next to each SBOM.
Use open formats. NTIA names SPDX, CycloneDX and SWID as the key formats. Offering the format your customers' tools read saves everyone time.
What sharing options exist?
Common patterns: a public page or repository, a customer portal with login, an API that tools poll, or a file attached to the release itself. Each trades convenience against control. A public repository suits open source. A portal with scoped accounts suits commercial software with a few hundred customers.
A constructed example
A vendor with 120 enterprise customers used to answer SBOM requests by email, averaging two days per request. It moved to a portal. Each customer sees only the products they license. Each release page has an SBOM and a VEX file. When a new library flaw appears, the vendor publishes VEX statements for the products it affects and the ones it does not. The two-day email thread becomes a link.
What are the traps?
Stale files. If the SBOM on the portal does not match the shipped build, trust collapses. Generate it in the build and publish it in the same pipeline.
Sensitive detail. An SBOM can reveal internal component names. Decide what to share publicly.
Format drift. Different teams producing different formats makes aggregation painful. Standardize.
How to check or apply this
- Decide who your consumers are and what each needs: full SBOM, VEX or only a summary.
- Pick one primary format and keep it for all products.
- Generate SBOMs in CI from the built artifact and publish automatically.
- Choose a sharing method: public page, authenticated portal or API.
- Define access rules and who approves a new customer.
- Publish VEX when you decide a flaw does not affect a release.
- Test it: have a customer find, download and ingest an SBOM without help.
Safeguard can generate SBOMs and manage dependency inventory across your products, which supplies the data a hub shares.
Do you need to build one?
Not always. A small vendor with a handful of customers can attach SBOMs to release notes. Build or buy a hub when requests become frequent, when access control matters or when customers want automated updates. The test is simple: if answering SBOM requests takes more than a few minutes of staff time, a hub is probably worth it.
Quick check
Who are the three SBOM roles in CISA guidance?
SBOM author, SBOM consumer and SBOM distributor.
Should I publish VEX with my SBOM?
It helps. VEX tells customers whether a given vulnerability affects your product, which saves them from chasing findings that do not apply.
Sources
- CISA, Software Bill of Materials
- CISA, SBOM Sharing Lifecycle Report
- NTIA, Software Bill of Materials
Last reviewed: 18 October 2026.
