| name | run2_cvss-score |
| description | Extract CVSS v3 scores from Trivy vulnerability data with source priority fallback (NVD > GHSA > RedHat) and handle missing data gracefully. |
CVSS Score Extraction from Trivy Data
CVSS Sources in Trivy Output
Trivy provides CVSS scores from multiple sources in the CVSS field:
- nvd: National Vulnerability Database (most authoritative)
- ghsa: GitHub Security Advisory
- redhat: Red Hat security team
Not all sources are present for every vulnerability.
Recommended Priority: NVD > GHSA > RedHat
NVD is the standard reference. GHSA is widely used for npm/GitHub ecosystems. RedHat is useful as a fallback.
Python Implementation
def get_cvss_score(vuln):
"""Extract best available CVSS v3 score with source priority fallback."""
cvss = vuln.get("CVSS") or {}
for source in ["nvd", "ghsa", "redhat"]:
entry = cvss.get(source)
if entry:
score = entry.get("V3Score")
if score is not None:
return score
return "N/A"
Real-world examples from npm scanning
- CVE-2024-29415 (ip): Only ghsa (8.1) and redhat (9.8) — no NVD score → returns 8.1
- CVE-2022-25883 (semver): All three sources at 7.5 → returns 7.5
- CVE-2026-23745 (tar): Only redhat (8.2) → returns 8.2
