vens — Prioritize vulnerabilities by real risk, not just CVSS

Your scanner found 300 CVEs. Which ones actually matter? Vens takes a Trivy or Grype report, combines it with a description of your system (exposure, data sensitivity, compliance, security controls), and scores every CVE based on its real risk to you — not just its generic severity.

The output is a CycloneDX VEX file with OWASP Risk Rating scores.

📖 Read the full documentation →

New to Vens? Start with the 5-minute quickstart or learn how to prioritize a CVE backlog.

Why vens?

Traditional scanners treat all vulnerabilities the same. Vens analyzes each CVE in your specific context to calculate real risk:

Risk = Likelihood × Impact (0-81 scale)

Illustrative example:

Scenario	CVSS (Generic)	OWASP (Contextual)	Why?
Generic RCE in a library whose vulnerable path is not executed	8.8 HIGH	10.0 LOW ⬇️	Not reachable in your runtime
Info leak in a PII handler running under GDPR	5.3 MEDIUM	52.0 HIGH ⬆️	PII leak + compliance impact

Scores above are illustrative — actual scores depend on your config.yaml and the LLM model.

Result: Fix what actually matters in YOUR system.

Installation

Standalone:

go install github.com/venslabs/vens/cmd/vens@latest

Trivy Plugin:

trivy plugin install github.com/venslabs/vens

Quick Example

# 1. Set up LLM (OpenAI shown — Anthropic, Google AI, or local Ollama also supported)
export OPENAI_API_KEY="sk-..."
export OPENAI_MODEL="gpt-4o"

# 2. Scan with Trivy or Grype
trivy image python:3.11-slim --format json --output report.json
# or
grype python:3.11-slim --output json --file report.json

# 3. Pin a stable per-service UUID (reuse across runs, do not regenerate each time)
SBOM_UUID="urn:uuid:$(uuidgen | tr '[:upper:]' '[:lower:]')"

# 4. Generate contextual risk scores
vens generate --config-file config.yaml --sbom-serial-number "$SBOM_UUID" report.json output.vex.json

# 5. Optionally fold the OWASP ratings back into the Trivy report
vens enrich --vex output.vex.json report.json

Output is a CycloneDX VEX document; each vulnerability carries an OWASP rating:

{
  "vulnerabilities": [{
    "id": "CVE-XXXX-YYYY",
    "source": { "name": "NVD", "url": "https://nvd.nist.gov/vuln/detail/CVE-XXXX-YYYY" },
    "ratings": [{
      "method": "OWASP",
      "score": 52.0,
      "severity": "high",
      "vector": "SL:7/M:7/O:7/S:7/ED:6/EE:6/A:6/ID:3/LC:7/LI:7/LAV:7/LAC:7/FD:7/RD:7/NC:7/PV:7"
    }]
  }]
}

The per-CVE reasoning from the LLM is logged to stderr as the command runs, and is captured alongside prompts/responses when you pass --debug-dir <path>. It is intentionally not embedded in the VEX file to keep the document strictly CycloneDX-compliant.

Configuration

Create config.yaml:

project:
  name: "my-api"
  description: "Customer-facing REST API"

context:
  exposure: "internet"              # internal | private | internet
  data_sensitivity: "high"          # low | medium | high | critical
  business_criticality: "high"      # low | medium | high | critical
  compliance_requirements: ["GDPR", "SOC2"]
  controls:
    waf: true

LLM Providers:

Provider	Environment Variable
OpenAI (recommended)	OPENAI_API_KEY
Anthropic	ANTHROPIC_API_KEY
Ollama (local)	OLLAMA_MODEL
Google AI	GOOGLE_API_KEY

Command Reference

vens generate

Generate VEX with contextual OWASP scores:

vens generate --config-file config.yaml INPUT OUTPUT

Supported scanners:

• ✅ Trivy - Auto-detected from JSON report format
• ✅ Grype - Auto-detected from JSON report format

Key flags:

• --config-file (required) - Path to config.yaml
• --input-format - Scanner format: auto | trivy | grype (default: auto)
• --llm - LLM provider: openai | anthropic | ollama | googleai (default: auto)
• --llm-batch-size - CVEs per request (default: 10)
• --debug-dir - Save prompts/responses for debugging

vens enrich

Apply VEX scores to your Trivy report:

vens enrich --vex output.vex.json report.json

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Learn More

• 📖 Full Documentation — installation, guides, reference
• 5-minute Quickstart — your first VEX
• Prioritize a CVE backlog — the common use case
• CVSS vs OWASP contextual — why the scores move
• Complete Example - 107 real CVEs comparison
• Trivy Plugin Guide - Plugin usage

Contributing

Contributions are welcome. See CONTRIBUTING.md for the full contributor guide: development setup, coding standards, testing with the mock LLM, commit conventions, and the review process.

Quick start for contributors:

• Good first issue? Look for the good first issue label.
• Bug report? Open an issue with the exact command, your vens --version, and (if possible) redacted --debug-dir output.
• Bigger change? Open an issue first so we can agree on scope before you write the code.
• Security report? See SECURITY.md — please do not open public issues for vulnerabilities.

License

Apache License 2.0 - See LICENSE

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Focus on what matters. Patch smarter, not harder.