# Security Audit Report - 2025-12-31

## Executive Summary

**Date**: 2025-12-31
**Auditor**: Claude Security Auditor
**Project**: session-buddy v0.10.4
**Platform**: macOS (darwin) / Python 3.13.11

### Results

- **Vulnerabilities Found**: 1 (down from reported 55)
- **Severity**: Medium (platform-specific)
- **Action Required**: Accept risk with documentation (no fix available)

______________________________________________________________________

## Vulnerability Details

### CVE-2025-53000 / GHSA-xm59-rqc7-hhvf

| Attribute | Value |
|-----------|-------|
| **Package** | nbconvert 7.16.6 |
| **CVE ID** | CVE-2025-53000 |
| **GHSA** | GHSA-xm59-rqc7-hhvf |
| **Severity** | Medium (7.1 CVSS) |
| **Fix Available** | No (`fix_versions: []`) |
| **Platform Affected** | Windows only |

### Description

On Windows, converting a notebook containing SVG output to a PDF results in unauthorized code execution. Specifically, a third party can create a `inkscape.bat` file that defines a Windows batch script, capable of arbitrary code execution.

When a user runs `jupyter nbconvert --to pdf` on a notebook containing SVG output to a PDF on a Windows platform from this directory, the `inkscape.bat` file is run unexpectedly.

**Root Cause**: CWE-427 (Uncontrolled Search Path Element) - The vulnerability occurs because nbconvert searches for the `inkscape` executable using a path that includes the current working directory on Windows.

### Attack Vector

1. Attacker creates a malicious `inkscape.bat` file in a directory
1. Attacker creates or places a `.ipynb` file with SVG content in the same directory
1. Victim runs `jupyter nbconvert --to pdf notebook.ipynb` from that directory on Windows
1. The malicious `inkscape.bat` is executed instead of the legitimate inkscape binary

______________________________________________________________________

## Risk Assessment for session-buddy

### Actual Risk: **ACCEPTABLE**

**Justification:**

1. **Platform Exclusion**: The vulnerability is **Windows-specific only**. Session-buddy is developed on macOS (`darwin` platform confirmed).

1. **No Direct Usage**: The vulnerable package (`nbconvert`) is not used directly by session-buddy. It is a transitive dependency:

   ```
   session-buddy -> crackerjack -> creosote -> nbconvert
   ```

1. **No nbconvert Usage**: session-buddy does not:

   - Convert Jupyter notebooks
   - Use the `--to pdf` flag
   - Process SVG content through nbconvert
   - Accept user-provided notebook files

1. **Development Dependency**: The vulnerable package is only used via `crackerjack`, which is a development dependency for code quality checking.

1. **No Fix Available**: The latest version of nbconvert (7.16.6) has no available fix. Removing the dependency would require removing crackerjack, which is a core development tool.

______________________________________________________________________

## Mitigation Strategies

### Current Mitigation (In Place)

1. **Platform Protection**: Development occurs on macOS, not Windows
1. **No User Input**: Session-buddy does not accept or process notebooks from users
1. **Development-Only**: The vulnerable code path is only accessible during development

### Additional Mitigations (If Needed)

If Windows development is required in the future:

1. **Disable nbconvert**: Add to `.gitignore` or explicitly exclude from requirements
1. **Use Container**: Run crackerjack in a Docker container with isolated file system
1. **Monitor Updates**: Watch for nbconvert security updates
1. **Alternative Linters**: Consider alternatives to creosote/crackerjack that don't use nbconvert

______________________________________________________________________

## Dependency Tree Analysis

```
session-buddy
  - crackerjack (0.47.0)
    - creosote (4.1.0)
      - nbconvert (7.16.6) [VULNERABLE]
        - beautifulsoup4
        - bleach
        - defusedxml
        - jinja2
        - jupyter-core
        - jupyterlab-pygments
        - markupsafe
        - mistune
        - nbclient
        - nbformat
        - packaging
        - pandocfilters
        - pygments
        - traitlets
```

______________________________________________________________________

## Other Packages Audited

All other packages (250+ total) were audited with **0 vulnerabilities found**:

| Package | Version | Status |
|---------|---------|--------|
| anthropic | 0.75.0 | No known vulnerabilities |
| openai | 2.14.0 | No known vulnerabilities |
| aiohttp | 3.13.2 | No known vulnerabilities |
| fastapi | 0.128.0 | No known vulnerabilities |
| cryptography | 46.0.3 | No known vulnerabilities |
| All other packages | - | No known vulnerabilities |

______________________________________________________________________

## Recommendations

1. **Continue Monitoring**: Run `pip-audit` monthly to check for nbconvert updates
1. **Document Decision**: Record this risk acceptance in project documentation
1. **No Immediate Action**: No package removal or changes needed at this time
1. **Windows Awareness**: If adding Windows developers, ensure they understand the limitation

______________________________________________________________________

## Command Reference

```bash
# Run security audit
pip-audit

# Run with JSON output
pip-audit --format json

# Check specific package
uv pip show nbconvert

# View dependency tree
uv pip list
```

______________________________________________________________________

## Audit Sign-Off

**Audited By**: Claude Security Auditor
**Date**: 2025-12-31
**Status**: COMPLETE - 1 vulnerability identified and assessed as acceptable risk
**Next Audit**: 2025-02-01 (or sooner if nbconvert update is released)
