Do not review every SBOM the same way. Sort suppliers into tiers by what they touch and how much your business depends on them, then set a different review depth and refresh rule for each tier. A small team can cover dozens of suppliers this way.
Why a flat approach fails
If twenty suppliers each send an SBOM, a reviewer who reads all twenty with equal care will finish none well. Worse, the file from a payroll vendor and the file from a design font plugin end up with the same attention.
The NTIA minimum elements report notes that depth and frequency are practices that the parties agree on, and that consumers can ask for different depth in operational terms, such as all non-open-source software. That wording supports a tiered approach: you decide what you need from each supplier, then say so.
Step 1: score each supplier on two questions
- Does the software touch sensitive data, run in production, or sit in a customer-facing path?
- If it failed or was compromised, how long could the business operate without it?
Two yes answers, or one strong yes, put the supplier in Tier 1. This is a judgment call, and it is fine to be rough. You can adjust later.
Step 2: set review depth per tier
| Tier | Who it covers | On receipt | Refresh |
|---|---|---|---|
| 1 | Production, sensitive data, hard to replace | Field check, scan, follow-up questions, owner named | Each release and on advisories |
| 2 | Internal tools, moderate impact | Field check and scan, ask about high severity only | Twice a year or on request |
| 3 | Low impact, easy to replace | Store and index; no manual review | On renewal |
Tier 3 is not neglect. A stored, indexed SBOM still answers the question "who ships this component?" the day an advisory appears. That is most of the value for low-impact suppliers.
Step 3: automate the first pass
Every tier should get the same automated checks on arrival: parse the file, confirm the seven minimum fields are present, match components against known vulnerability data, and flag anything unusual. Humans only enter the picture where the tier says they should.
Step 4: name an owner per supplier
An SBOM with no owner is a file in a folder. For Tier 1 and 2 suppliers, write one name next to each: the person who talks to the supplier when a question arises. This is usually an engineering lead or the business owner, not the security team.
Step 5: review the tiers quarterly
Suppliers change. A tool that started as a pilot may now be in production. Spend fifteen minutes each quarter checking whether any supplier should move up or down.
Try it yourself
Click through it at your own pace, or open it full screen. Notice how findings are grouped and prioritized so a reviewer sees the important ones first.
Safeguard's SBOM and dependency scanning can run the automated first pass, and policies and gates can enforce the thresholds you choose. The free scan is at gold.safeguard.sh/scan.
Quick check
Is it acceptable to skip manual review for low-tier suppliers?
Yes, as long as you store and index the SBOM. The value is being able to search when an advisory lands.
How many tiers do we need?
Three is enough for most teams. More tiers add upkeep without changing what you do.
Sources
Last reviewed: 19 October 2026.
