An SBOM distributor receives SBOMs in order to share them with consumers or other distributors. CISA's sharing documents added the role to cover organizations that neither author SBOMs nor use their data, such as registry operators, portal hosts or a tier one supplier passing upstream files to a manufacturer.
Where the role comes from
The earlier Sharing Lifecycle Report of April 2023 used the word provider for whoever possessed an SBOM. CISA's later documents replaced it. In the Roles and Considerations paper, the provider role is split between the author, who creates the SBOM and makes it available, and the distributor, who obtains and holds SBOMs for the purpose of sharing them.
The paper says this role is "a new addition to the SBOM sharing discussion" and introduced "to capture the role of organizations that neither produce SBOMs nor make use of SBOM data."
What distributors consider
CISA's paper lists considerations for each phase. For discovery, a distributor weighs the author's guidelines for discoverability, consumer requests, and how to handle multiple SBOMs and authors for the same component. In practice the distributor also has to think about:
- Whether it may share a file at all under the author's terms.
- How to tag and index SBOMs so they can be found.
- How to keep access rules the author set.
- How to deliver updated versions rather than stale copies.
The documents do not make these rules. They are factors to consider, not requirements.
Examples from the primer
Container registries. Where a container registry stores SBOMs as artifacts, the registry operator acts as a distributor.
Federated attestation registries. The primer says distributors manage the federated services, which let organization specific deployments pull data from central ones while keeping sensitive data apart.
Tiered suppliers. In the automotive example, a tier one supplier bundles upstream suppliers' SBOMs with its own and makes them available to the automaker. It acts as both distributor and author. See how SBOMs travel up an automotive supplier chain.
Hubs and management concepts
The word hub does not appear in CISA's role definitions, but the idea fits: a place that collects SBOMs from many authors and serves them to many consumers. A hub raises the same questions as any distributor. Who may deposit? Who may read? How are versions and corrections handled? How do you avoid serving a stale file?
If you are one
You may be a distributor without calling yourself one. Check whether you hold SBOMs on behalf of others. If you do, write down your access rules, your retention rule and your update process, and tell authors what you will do with their files.
Quick check
Can one organization be author, distributor and consumer?
Yes. CISA says organizations can be multi-hatted, acting as any combination of the three roles.
Is a distributor responsible for SBOM quality?
CISA's sharing documents do not discuss SBOM quality. Responsibility depends on your agreements.
Sources
Last reviewed: 19 October 2026.
