Last updated: 2026-01-27

All dependencies have been verified to be free of known vulnerabilities:

• Previous Version: Flask 2.3.0
• Vulnerability: Missing Vary: Cookie header could lead to permanent session cookie disclosure
• CVE References: Affects versions >= 2.3.0, < 2.3.2 and < 2.2.5
• Resolution: Updated to Flask 2.3.2
• Status: ✅ PATCHED

• Language: Python, JavaScript
• Alerts: 0
• Status: ✅ PASSED
• Last Scan: 2026-01-27

1. ✅ No Debug Mode in Production

   • Debug mode controlled via FLASK_DEBUG environment variable
   • Default is production mode (debug=False)

2. ✅ Sanitized Error Messages

   • Generic error messages for users
   • Detailed errors only logged server-side
   • No sensitive information leakage

3. ✅ Specific Exception Handling

   • SyntaxError for parsing errors
   • ValueError for invalid input
   • Generic catch-all for unexpected errors

4. ✅ Input Validation

   • Expression validation before processing
   • Character position tracking without exposing input
   • Safe error reporting

5. ✅ No External Dependencies at Runtime

   • Fully offline application
   • No CDN dependencies
   • All assets served locally

For production deployment, consider:

1. Use a Production WSGI Server

   pip install gunicorn
   gunicorn -w 4 app:app

2. Set Environment Variables

   export FLASK_DEBUG=false
   export FLASK_ENV=production

3. Enable HTTPS

   • Use reverse proxy (nginx, Apache)
   • Obtain SSL certificate (Let's Encrypt)

4. Add Rate Limiting (optional)

   pip install flask-limiter

5. Monitor Logs

   • Configure proper logging
   • Monitor for unusual activity

If you discover a security vulnerability, please report it to the repository maintainer through GitHub Security Advisories.

• Check for dependency updates regularly
• Run pip list --outdated to find updates
• Monitor GitHub Advisory Database
• Keep CodeQL scans up to date

To verify security status:

# Check dependency versions
pip list | grep -E "(Flask|Werkzeug)"

# Scan for vulnerabilities (requires safety)
pip install safety
safety check

# Run CodeQL (if available)
codeql database create --language=python

Security Status: ✅ All known vulnerabilities have been addressed. Last Verified: 2026-01-27