{"id":"PYSEC-2026-1429","summary":"GuardDog Zip Bomb Vulnerability in safe_extract() Allows DoS","details":"## Summary\n\nGuardDog's `safe_extract()` function does not validate decompressed file sizes when extracting ZIP archives (wheels, eggs), allowing attackers to cause denial of service through zip bombs. A malicious package can consume gigabytes of disk space from a few megabytes of compressed data.\n\n## Vulnerability Details\n\n**Affected Component:** `guarddog/utils/archives.py` - `safe_extract()` function  \n**Vulnerability Type:** CWE-409 - Improper Handling of Highly Compressed Data (Zip Bomb)  \n**Severity:** HIGH (CVSS ~8)  \n**Attack Vector:** Network (malicious package uploaded to PyPI/npm) or local\n\n### Root Cause\n\nThe `safe_extract()` function handles TAR files securely using the `tarsafe` library, but ZIP file extraction has no size validation:\n```python\nelif zipfile.is_zipfile(source_archive):\n    with zipfile.ZipFile(source_archive, \"r\") as zip:\n        for file in zip.namelist():\n            zip.extract(file, path=os.path.join(target_directory, file))\n```\n\n**Missing protections:**\n- ❌ No decompressed size limit\n- ❌ No compression ratio validation  \n- ❌ No file count limits\n- ❌ No total extracted size validation\n\n## Impact\n\n### Denial of Service Scenarios\n\n**1. CI/CD Pipeline Disruption**\n- Attacker publishes malicious package to PyPI\n- Developer adds package to requirements.txt\n- CI/CD runs GuardDog scan\n- Disk fills (GitHub Actions: standard 14GB limit)\n- All deployments blocked\n\n**2. Resource Exhaustion**\n- Local development environments\n- Security scanning infrastructure  \n- Automated scanning systems\n- Docker containers with limited disk\n\n**3. Supply Chain Attack Amplification**\n- Single malicious package blocks security scanning\n- Prevents detection of other malicious packages\n- Forces manual intervention\n- Increases security team workload\n\n## Recommended Fix\n\nAdd size validation for ZIP files similar to what `tarsafe` provides for TAR files\n\n### Configuration Options\n\nMake limits configurable via environment variables or config file\n\n## Additional Improvements\n\n1. **Add warning logs** when archives approach limits\n2. **Provide clear error messages** for users\n3. **Document limits** in user-facing documentation\n4. **Add tests** for zip bomb detection\n5. **Consider using a safe ZIP library** (similar to tarsafe)\n\n## Credit\n\nReported by: Charbel (dwbruijn)","aliases":["CVE-2026-22870","GHSA-ffj4-jq7m-9g6v"],"modified":"2026-07-07T17:47:41.998875138Z","published":"2026-07-07T16:03:18.568781Z","references":[{"type":"WEB","url":"https://github.com/DataDog/guarddog/security/advisories/GHSA-ffj4-jq7m-9g6v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22870"},{"type":"WEB","url":"https://github.com/DataDog/guarddog/commit/c3fb07b4838945f42497e78b7a02bcfb1e63969b"},{"type":"PACKAGE","url":"https://github.com/DataDog/guarddog"},{"type":"PACKAGE","url":"https://pypi.org/project/guarddog"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-ffj4-jq7m-9g6v"}],"affected":[{"package":{"name":"guarddog","ecosystem":"PyPI","purl":"pkg:pypi/guarddog"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.1"}]}],"versions":["0.1.1","0.1.10","0.1.3","0.1.4","0.1.5","0.1.6","0.1.7","0.1.8","0.1.9","1.0.0","1.0.1","1.0.2","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.10.0","1.10.1","1.11.0","1.11.1","1.11.2","1.2","1.2.1","1.3.0","1.4.0","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.6.0","1.7.0","1.8.0","1.8.1","1.8.2","1.9.0","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.1.0","2.2.0","2.3.0","2.4.0","2.5.0","2.6.0","2.7.0"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/guarddog/PYSEC-2026-1429.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}