MEDIUM5.3

GHSA-4h8q-hh2j-755w

BlenderMCP path traversal in download_polyhaven_asset allows arbitrary file writes

Quick fix

GHSA-4h8q-hh2j-755w — 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

PyPI/blender-mcp

Introduced in: 0Fixed in: 1.6.5

Fixpip install --upgrade 'blender-mcp>=1.6.5'

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]