velonus

AI-native application security scanner for developers. Finds real issues. Explains why they matter. Generates fixes.

This repo is the open-source scanner core of Velonus: the CLI, the scan pipeline (packages/scanner), and finding normalization/deduplication (packages/normalizer). Running velonus scan locally never sends your code anywhere — it's fully self-contained.

The AI triage/remediation engine, GitHub App integration (one-click fix PRs with generated regression tests), and web dashboard are part of the hosted Velonus platform and are proprietary — velonus scan --ai talks to that API, everything else in this repo runs entirely on your machine.

Table of Contents

• Installation
• Quick Start
• Commands
  • velonus scan
  • velonus auth
  • velonus config
  • velonus pr review
  • velonus ci
• Output Formats
• Severity Levels
• CI/CD Integration
• What's under the hood
• License

Installation

Requirements

• Python 3.10+
• Windows / macOS / Linux

Install via pip

pip install velonus

This installs the CLI plus Bandit, pip-audit, and Safety (the core scanner tools). Two extras add more coverage:

pip install velonus[semgrep]          # Semgrep ruleset (~200MB, optional)
pip install velonus[detect-secrets]   # detect-secrets, higher-fidelity secret scanning
pip install velonus[semgrep,detect-secrets]

Verify install:

velonus --version

Quick Start

# Scan the current directory
velonus scan ./

# Scan a specific project
velonus scan ./my-python-project

# Only show HIGH and CRITICAL findings
velonus scan ./ --severity high

# Output as JSON (for piping or tooling)
velonus scan ./ --format json

# Submit to the Velonus API for AI triage + fix suggestions (requires `velonus auth login`)
velonus scan ./ --ai

Commands

velonus scan

Runs the security scanner pipeline (secrets, Bandit, Semgrep, pip-audit, Safety) on a local path and prints findings to the terminal.

velonus scan [PATH] [OPTIONS]

Examples

velonus scan ./                                       # scan current directory
velonus scan ./ --severity high                        # only critical + high
velonus scan ./ --exclude migrations/ --exclude '*/generated_*.py'
velonus scan ./ --detectors bandit,semgrep              # only run these two
velonus scan ./ --format json > findings.json
velonus scan ./ --sarif                                 # for GitHub Code Scanning

Exit Codes

Exit code 1 on HIGH/CRITICAL is intentional — use it as a CI gate to block merges.

velonus auth

Manages authentication with the Velonus API (only needed for --ai, pr review).

velonus auth login    # prompts for API key, verifies it, stores it in ~/.velonus/config.toml
velonus auth logout   # clears stored credentials
velonus auth status   # shows masked key + live connectivity check

velonus config

Manages local CLI configuration at ~/.velonus/config.toml.

velonus config show
velonus config set scan.detectors bandit,semgrep

velonus pr review

Runs an on-demand AI-assisted review of an open GitHub pull request (requires velonus auth login and a connected GitHub App installation on the hosted platform).

velonus pr review https://github.com/org/repo/pull/123

velonus ci

Generates a ready-to-use CI workflow file that runs Velonus and uploads SARIF to GitHub code scanning.

velonus ci --generate-workflow                        # writes .github/workflows/velonus.yml
velonus ci --generate-workflow --provider github-actions --output custom/path.yml

Output Formats

terminal (default)

Colored Rich table with severity badges, file paths, line numbers, rule IDs, and messages.

┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Severity       ┃ Tool       ┃ File          ┃ Line  ┃ Rule             ┃ Message                      ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ 🔴 CRITICAL    │ secrets    │ config.py     │ 12    │ aws-access-key   │ Hardcoded AWS access key…    │
│ 🟠 HIGH        │ bandit     │ auth/views.py │ 87    │ B106             │ Hardcoded password in func…  │
│ 🟡 MEDIUM      │ semgrep    │ db/query.py   │ 43    │ python.sqli      │ Possible SQL injection…      │
└────────────────┴────────────┴───────────────┴───────┴──────────────────┴──────────────────────────────┘

Total: 3 findings  —  1 CRITICAL  1 HIGH  1 MEDIUM

json

A JSON array of NormalizedFinding objects — suitable for piping into other tools.

velonus scan ./ --format json | python -m json.tool

sarif

Static Analysis Results Interchange Format 2.1.0 — compatible with GitHub Code Scanning, VS Code's SARIF Viewer, and other SAST tooling.

Severity Levels

CI/CD Integration

Generate a workflow automatically:

velonus ci --generate-workflow

Or add this manually to .github/workflows/security.yml:

name: Velonus Security Scan

on: [push, pull_request]

jobs:
  scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"
      - run: pip install velonus
      - run: velonus scan ./ --severity high
        # exits 1 on HIGH/CRITICAL findings — blocks the merge

Pre-commit hook

repos:
  - repo: local
    hooks:
      - id: velonus-scan
        name: Velonus Security Scan
        entry: velonus scan
        args: ["./", "--severity", "high"]
        language: system
        pass_filenames: false

What's under the hood

• apps/cli — Typer CLI, Rich terminal output, config management, API client for --ai/pr review/auth.
• packages/scanner — parallel wrappers around Bandit, Semgrep, pip-audit, Safety, and secret detection (detect-secrets + entropy fallback). Nothing here is a reimplementation of these tools — Velonus orchestrates and normalizes their output.
• packages/normalizer — converts every tool's raw output into one NormalizedFinding shape, maps CWE/OWASP, and deduplicates (exact fingerprint + cross-tool same-location merge).

This pipeline was built to be scanner-agnostic at the finding level — Python via these five tools is the first target, with more language/tool coverage planned.

License

MIT — this repo (CLI + scanner core) is fully open source. The AI triage/remediation engine, GitHub App integration, and web dashboard that power --ai and pr review are part of the proprietary hosted platform at velonus.io.