Velonus – Open-source AppSec scanner that deduplicates SAST noise

Velonus

Security scanning for Python developers that actually tells you how to fix things.
One command. Five scanners. Zero noise.

pip install velonus velonus scan ./your-project

Requires Python 3.10+

Demo

$ velonus scan ./myapp Scanning with 5 tools... secrets ████████████████████ 0.3s bandit ████████████████████ 2.1s semgrep ████████████████████ 4.2s pip-audit ████████████████████ 1.8s safety ████████████████████ 1.2s ┌──────────────┬──────────────────────────────────────────┬──────────────────┬──────────┐ │ Severity │ Finding │ Location │ Tool │ ├──────────────┼──────────────────────────────────────────┼──────────────────┼──────────┤ │ 🔴 CRITICAL │ Hardcoded AWS secret key │ config.py:14 │ secrets │ │ 🔴 CRITICAL │ Hardcoded OpenAI API key │ llm_client.py:8 │ secrets │ │ 🔴 CRITICAL │ SQL injection via string format │ db/queries.py:41 │ semgrep │ │ 🟠 HIGH │ Use of MD5 for password hashing │ auth/utils.py:27 │ bandit │ │ 🟠 HIGH │ requests 2.28.0 — CVE-2023-32681 (8.1) │ requirements.txt │ pip-aud │ │ 🟡 MEDIUM │ Shell injection via subprocess │ runner.py:19 │ bandit │ │ 🟡 MEDIUM │ Hardcoded JWT secret │ auth/tokens.py:3 │ secrets │ └──────────────┴──────────────────────────────────────────┴──────────────────┴──────────┘ 3 CRITICAL │ 7 HIGH │ 12 MEDIUM │ 34 LOW

What It Detects

Category	Tool	What it catches
Hardcoded secrets	trufflehog + entropy	API keys, AWS creds, JWT tokens, PEM keys
Python SAST	Bandit	Injections, weak crypto, unsafe shell exec
Pattern analysis	Semgrep	OWASP Top 10 vulnerability patterns
Dependency CVEs	pip-audit	Known CVEs with CVSS v3 scores
Vulnerability DB	Safety	Package vulnerability cross-reference

All findings are normalized to a unified schema with CWE tags, OWASP Top 10 categories, and deterministic fingerprints for deduplication.

Output Formats

velonus scan ./ # Rich terminal table (default) velonus scan ./ --format json # JSON array — pipe to jq, scripts, etc. velonus scan ./ --sarif # SARIF file → GitHub Security tab velonus scan ./ --severity high # Filter to HIGH and CRITICAL only velonus scan ./ -o results/scan.sarif # Write SARIF to a custom path

CI Integration

- name: Velonus security scan run: | pip install velonus velonus scan . --sarif -o velonus.sarif - name: Upload to GitHub Security tab uses: github/codeql-action/upload-sarif@v4 with: sarif_file: velonus.sarif

Velonus exits 1 on CRITICAL or HIGH findings — use it as a hard CI gate.

Roadmap

	Phase	Status
✅	Phase 0 — CLI + secret detection	Done
✅	Phase 1 — Full scanner pipeline (Bandit, Semgrep, pip-audit, Safety)	Done
🔨	Phase 2 — AI context engine (exploitability scoring + fix generation)	Building
🔜	Phase 3 — GitHub PR integration (inline fixes, one-click accept)	Planned
🔜	Phase 4 — Web dashboard	Planned

Alpha Notice

Velonus is in alpha. It works — we use it ourselves — and we want your feedback.
Expect rough edges. Report issues and we will fix them fast.

Contributing

See CONTRIBUTING.md for dev setup, test instructions, and PR guidelines.
Found a security issue? See SECURITY.md.
All contributions welcome — especially scanner improvements and false-positive reports.

License

MIT — see LICENSE.

Install uv if you don't have it

pip install uv

Install all workspace packages

uv sync --all-extras --dev

Activate the virtual environment

source .venv/bin/activate # macOS/Linux .venv\Scripts\Activate.ps1 # Windows PowerShell

Install the CLI in editable mode

pip install -e apps/cli pip install -e packages/scanner pip install -e packages/normalizer

**Verify the install:** ```bash velonus --help

Usage

Scan a project

# Scan the current directory velonus scan ./ # Scan a specific path velonus scan ./src # Only show HIGH and above velonus scan ./ --severity high # Verbose output (shows per-tool timing) velonus scan ./ --verbose

Output formats

# Default: rich terminal table velonus scan ./ # JSON (pipe-friendly) velonus scan ./ --format json # Write a SARIF file (for GitHub Security tab) velonus scan ./ --sarif # Write SARIF to a custom path velonus scan ./ -o results/velonus.sarif

Use in CI (GitHub Actions)

- name: Velonus security scan run: velonus scan . --sarif -o velonus-results.sarif - name: Upload to GitHub Security tab uses: github/codeql-action/upload-sarif@v4 with: sarif_file: velonus-results.sarif

Velonus exits with code 1 when CRITICAL or HIGH findings are detected — use this as a CI gate.

Pre-commit hook

# .pre-commit-config.yaml repos: - repo: local hooks: - id: velonus name: Velonus security scan entry: velonus scan language: system pass_filenames: false args: ["./", "--severity", "high"]

Example Output

✓ Running secret detection... [0.3s] ✓ Running Bandit... [2.1s] ✓ Running Semgrep... [4.2s] ✓ Running pip-audit... [1.8s] ✓ Running Safety... [1.2s] ────────────────────────────────────────────── 3 CRITICAL │ 7 HIGH │ 12 MEDIUM │ 34 LOW ⚠ CRITICAL Hardcoded AWS key detected → src/config.py:14 CWE-798 · A07:2021

Tech Stack

• CLI — Python, Typer, Rich
• API — FastAPI, PostgreSQL, ARQ
• AI — Anthropic Claude (Sonnet for fixes, Haiku for triage)
• Scanners — Semgrep, Bandit, pip-audit, Safety
• Dashboard — Next.js, Tailwind, shadcn/ui
• Auth — Clerk
• Infra — Docker, Railway

Target Users

• Python developers and AI startups
• Small SaaS teams without a dedicated security team
• Engineers who want security that fits into their workflow

Contributing

Velonus is currently in private development. Contribution guidelines will be published when the CLI core is open sourced after Phase 5.

See CONTRIBUTING.md for setup instructions that apply today.

License

Private — All rights reserved until open source release.