CVE-2026-66004 BlenderMCP Path Traversal via download_polyhaven_asset API
Attackers can write arbitrary files via path traversal in the download_polyhaven_asset API, potentially achieving persistent code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-66004?
CVE-2026-66004 is a medium-severity path traversal vulnerability in ahujasid blender-mcp, published on 24 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-66004?
3 open source packages ship an affected version, including blender-mcp.
| Package | Affected | Fixed in |
|---|---|---|
blender-mcp PyPI | All versions | 1.6.5 |
blender-mcp PyPI | All versions | 1.6.5 |
blender-mcp PyPI | All versions | 1.6.5 |
How do I fix CVE-2026-66004?
Upgrade blender-mcp to 1.6.5 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-66004 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66004 exists.
Sources
Also known as GHSA-4h8q-hh2j-755w, PYSEC-2026-4203.