It means that no published advisory your tool checks matches that exact package version. It does not mean the code has been reviewed, that no bugs exist, or that the package is not malicious. It is a statement about databases, not about the code.
Where the answer comes from
A scanner or audit command compares package names and versions to a list of published advisories. If nothing matches, it reports clean. The npm audit command, for example, sends a description of your dependencies to the registry and gets back known vulnerabilities for them.
What the phrase leaves out
- New problems. A flaw found yesterday may not be published yet, or may not have reached your tool's data.
- Unreported problems. Most bugs in small packages are never reported at all.
- Malicious packages. A package built to steal credentials is not a vulnerability in the usual sense, and a new one often has no advisory for a while.
- Your own use. A safe library can be used in an unsafe way.
- Coverage gaps. Different databases cover different ecosystems and have different delays.
How to read a clean result
Read it as "nothing I can look up today". That is still useful. It rules out the large pile of already known problems, which is where most real incidents come from.
What to add for a better picture
Pair the scan with the checks that databases cannot do. Review who publishes the package. Look at what runs at install time. Use a lockfile so the version you tested is the version you ship. Re-scan on a schedule, because a clean result today can change tomorrow without any change in your code.
Why scheduling matters
Advisories are published against old versions all the time. A dependency that scanned clean in March can be flagged in October. Continuous scanning catches that without anyone remembering to look. If you want to see what is already in your own dependencies, Safeguard offers a free scan at https://gold.safeguard.sh/scan.
Try it yourself
Click through it at your own pace, or open it full screen. Watch how a result changes after the data updates, even though the code stayed the same.
Quick check
Is no known vulnerabilities the same as secure?
No. It is a narrow statement about published advisories for a version number.
How often should I rescan?
Often enough that a new advisory reaches you within days. Daily or on every build is common.
Sources
Last reviewed: 19 October 2026.
