Real time vulnerability monitoring usually means your inventory is re-matched whenever new advisory data arrives, rather than only when you run a scan. It does not mean you learn about a flaw at the moment it is discovered, because the advisory itself may not exist yet.
Define the phrase
Marketing uses "real time" loosely. Break it into two claims.
- Matching is continuous: the tool keeps a list of what you run and checks it against new records as they appear.
- Data is current: the tool ingests new records quickly from its sources.
The first is about your side. The second is about the supply of records, which no scanner controls.
Myth versus fact
| Myth | Fact |
|---|---|
| Real time means I hear about a flaw as it is found | You hear when a record is published and ingested. Many flaws are known privately first |
| Continuous monitoring finds issues without scanning | It still needs an inventory, and that inventory must be current |
| Faster alerts mean lower risk | Only if someone acts on them. See an alert nobody acts on is not a control |
| One feed is enough | Sources differ in speed, coverage and review. EPSS, for example, is updated daily, while KEV changes when CISA adds an entry |
What the sources actually promise
Read the documentation, not the headline. OSV describes its sources as continuously exported but gives no interval. GitHub says new vulnerabilities may take time to appear and trigger alerts, with no time window. CISA's KEV page shows a date added and a due date for each entry, and offers subscription to update notices, but states no fixed publishing cycle. None of these promise delivery in seconds.
Questions to ask a vendor
- Which advisory sources do you read, and how often do you sync each?
- Is matching triggered by new data, or only by my scan schedule?
- How do you keep my inventory current between builds?
- What happens when a record is corrected or withdrawn?
- Can you show timestamps from publication to alert on a real example?
A vendor that answers with timestamps is more credible than one that answers with an adjective.
What you can do yourself
Keep a current SBOM for each release, subscribe to the KEV update notices, and log the delay between a public advisory and your first alert. That log is your own evidence of how real time your setup really is.
Where Safeguard fits
Safeguard's SBOM and dependency scanning maintains the inventory, and its zero-day discovery targets flaws before a record exists. A free scan shows the starting inventory.
Quick check
Can any tool alert me on a vulnerability nobody has published?
Only if the tool finds it itself, for example through its own research. Matching tools depend on published records.
Is daily scanning the same as real time?
No. Daily means up to a day of delay. Whether that is acceptable depends on the severity and your response time.
Sources
- OSV data sources, osv.dev
- About Dependabot alerts, GitHub Docs
- Known Exploited Vulnerabilities Catalog, CISA
- EPSS FAQ, FIRST
Last reviewed: 19 October 2026.
