Velonus – Open-source AppSec scanner that deduplicates SAST noise

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.