// facet: open-source
Open-source vulnerability scanners: production-grade in 2026
Open-source scanners that hold their own against commercial tools in 2026, scored on coverage, feed currency, and loaded admin cost.
author: Oliver Wakefield-Smith · verified 2026-06-26
// direct-answer
What is the best open-source vulnerability scanner in 2026?
OpenVAS / Greenbone Community Edition (network), Trivy (containers and IaC), Nuclei (template-based web and infra), OWASP ZAP (web DAST). All four are production-grade within their domains. The real cost is admin hours and feed lead-time versus commercial scanners.
// filter ::
asset
deployment
scan-type
compliance
price-band
license
scanner
asset
deploy
price-band
compliance / free
open
OpenVAS / Greenbone Community Edition
Self-hosted GPL scanner. Real cost is admin hours and feed lag versus Nessus.
verified 2026-06-25 · vendor page
network
self-hosted
FREE / OSS
Free (self-hosted). Greenbone Enterprise appliances quote-only.
pci-asvfree tier
Trivy
De-facto open-source container / IaC / SBOM scanner. CI/CD minutes are the real cost.
verified 2026-06-25 · vendor page
containercodeiac
self-hosted
FREE / OSS
Free (Apache 2.0). Aqua Enterprise quote-only.
soc2free tier
[ 2 of 15 scanners shown ] · row prices verified against vendor pages on the date stamped above.
Loaded cost honesty
OpenVAS at any meaningful scale takes 4-12 admin hours per month. Loaded at $95/hr, that is $4.5k-$13.5k per year before infra. Nessus Professional is $4,790/yr list. Below ~$10k/yr of loaded admin cost OSS wins; above, commercial typically wins on TCO.
// faq
FAQ
- Can OSS scanners produce PCI evidence?Output can be packaged into a PCI evidence pack but you typically still need an ASV-attested external scan from a commercial PCI ASV. OSS handles the internal evidence layer.
- Is Nuclei production-grade?Yes. Used widely in bug bounty and CI/CD scan pipelines. Template community is active and the binary is fast.
- When does OWASP ZAP hit its ceiling?Complex authenticated SPA flows and out-of-band detection. Burp Enterprise and Invicti lead there.
- Which has the best feed currency?Trivy refreshes its DB hourly; OpenVAS NVT feed updates daily but lags commercial Nessus plugins by hours to days on newer CVEs.
- Is the Greenbone Enterprise Appliance worth it over Community?Yes if you want supported updates, NVT feed lead-time matching Nessus, and a hardware appliance with vendor support. Pricing is quote-only.