# CVE-2026-34789: FreeCAD: Arbitrary code execution via unsandboxed PyImport_ImportModule in PropertyPythonObject::Restore

CVE-2026-34789 is fixed in 2 products on 2 platforms, first by FreeCAD 1.1.2, released July 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-34789
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 17, 2026
- Weakness: CWE-94: Improper Control of Generation of Code ('Code Injection')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34789

## Description

FreeCAD is a free and open-source multiplatform 3D parametric modeler. Prior to 1.1.2, src/App/PropertyPythonObject.cpp in PropertyPythonObject::Restore() passes the attacker-controlled module attribute from serialized PropertyPythonObject XML directly to PyImport_ImportModule() while restoring a crafted FCStd document, which executes module-level Python code, and the legacy pickle branch also imports an attacker-controlled module and invokes its class constructor through PyObject_CallObject(). This issue is fixed in version 1.1.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | FreeCAD | 1.1.2 | [FreeCAD 1.1.2](https://patchblox.com/security/data/fix/windows-app/freecad.freecad-1.1.2.md) | Jul 23, 2026 |
| Linux | freecad Debian 12.15 (bookworm) | 0.20.2+dfsg1-4+deb12u1 | [DEBIAN-CVE-2026-34789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34789.md) | Aug 27, 2026 |
| Linux | freecad Debian 13.5 (trixie) | 1.0.0+dfsg-8+deb13u3 | [DEBIAN-CVE-2026-34789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34789.md) | Aug 27, 2026 |
| Linux | freecad Debian 14 | 1.1.3+dfsg-1 | [DEBIAN-CVE-2026-34789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34789.md) | Aug 27, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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