High [CVE-2026-34789] Arbitrary code execution via crafted document restoration
This high-severity Red Hat Linux advisory covers CVE-2026-34789.
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Summary
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. A remote attacker could exploit this vulnerability by tricking a user into opening a specially crafted FCStd document.
When the document is restored, attacker-controlled module attributes are processed, leading to the execution of arbitrary Python code. This could result in a complete system compromise.
This Important vulnerability in FreeCAD allows for arbitrary code execution when a user opens a specially crafted FCStd document. Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-502.
- < 1.1.2
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Mitigation
Upgrade to a fixed release: 1.1.2. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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