MEDIUM5.3
PYSEC-2026-4203
BlenderMCP path traversal in download_polyhaven_asset allows arbitrary file writes
Quick fix
PYSEC-2026-4203 — blender-mcp: upgrade to the fixed version with the command below.
pip install --upgrade 'blender-mcp>=1.6.5'Details
BlenderMCP before commit 30a3308 contains a path traversal vulnerability in the download_polyhaven_asset method that allows attackers to write arbitrary files by injecting traversal sequences in API response include keys. Attackers performing MITM attacks or prompt injection can supply malicious paths like '../../.bashrc' to overwrite sensitive files and achieve persistent code execution.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-66004[ADVISORY]
- https://github.com/ahujasid/blender-mcp/issues/257[WEB]
- https://github.com/ahujasid/blender-mcp/pull/258[WEB]
- https://github.com/ahujasid/blender-mcp/commit/30a3308446cd8f81a9446e5a2ed657c0d8d86072[WEB]
- https://github.com/ahujasid/mcp-for-blender[PACKAGE]
- https://www.vulncheck.com/advisories/blendermcp-path-traversal-via-download-polyhaven-asset-api[WEB]
- https://pypi.org/project/blender-mcp[PACKAGE]
- https://github.com/advisories/GHSA-4h8q-hh2j-755w[ADVISORY]