SECURITY_AUDIT.md

StreamXL Security Audit

Last Audited: July 2026
Status: Minimal security concerns; standard practices

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🟡 HIGH Priority Issues

1. No Dependency Version Pinning

Severity: HIGH
Finding: 0 pinned, no deps listed

Timeline: v1.0.1 (Q3 2026)

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🔵 MEDIUM Priority

2. No Input Validation on File Paths

Risk: Path traversal if writing to user-specified paths
Severity: MEDIUM

Recommendation:

from pathlib import Path

def validate_write_path(path: str) -> Path:
    p = Path(path).resolve()
    if not p.suffix.lower() == '.xlsx':
        raise ValueError("Must write to .xlsx file")
    return p

Timeline: v1.1.0 (Q3 2026)

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3. No File Corruption Detection

Risk: Partial writes could corrupt Excel files
Severity: MEDIUM

Recommendation:

• Verify file integrity after write
• Atomic writes (write to temp, then rename)
• CRC/hash validation

Timeline: v1.2.0 (Q4 2026)

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🔵 LOW Priority

4. No Secrets Scanning in CI

Timeline: v1.0.2 (Q3 2026)

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Security Roadmap

Issue	Severity	Target
Pin dependencies	HIGH	v1.0.1
Path validation	MEDIUM	v1.1.0
File integrity checks	MEDIUM	v1.2.0
CI secrets scanning	LOW	v1.0.2

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Testing

pip-audit --strict
bandit -r . -ll

# Test path traversal attempts
assert raises(ValueError, validate_write_path, "../../../etc/passwd.xlsx")

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Deployment

• Validate all input file paths
• Use atomic writes (write-then-rename)
• Monitor disk space to prevent partial writes
• Run with read-only file system where possible