Description
FreeCAD is a free and open-source multiplatform 3D parametric modeler. Prior to 1.1.2, the Xerces SAX2 XMLReader constructed in src/Base/Reader.cpp by Base::XMLReader::XMLReader() parses attacker-controlled Document.xml from a crafted .FCStd archive without disabling default external entity resolution or external DTD loading. When Document::restore() opens the document, external entities can read local files through the file URI scheme or initiate server-side requests through the http URI scheme, and resolved content can flow through the characters() callback. This issue is fixed in version 1.1.2.
References6
- github.com/FreeCAD/FreeCAD/commit/7d1b8f5806db578db99feb348e55a…
- github.com/FreeCAD/FreeCAD/commit/d98eaf1f194400d8a8886fe6780c5…
- github.com/FreeCAD/FreeCAD/pull/31271
- github.com/FreeCAD/FreeCAD/pull/31280
- github.com/FreeCAD/FreeCAD/releases/tag/1.1.2
- github.com/FreeCAD/FreeCAD/security/advisories/GHSA-cp6c-87x9-x…
Metrics
- CVSS 3.1
-
6.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N - EPSS — exploit probability
- 0% percentile: 2 · as of 12 November 2026
- CWE
- CWE-611
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.