FreeCAD up to 1.1.1 Xerces SAX2 XMLReader src/Base/Reader.cpp server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in FreeCAD up to 1.1.1. This affects the function Base::XMLReader::XMLReader of the file src/Base/Reader.cpp of the component Xerces SAX2 XMLReader. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-73235. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in FreeCAD up to 1.1.1. It has been declared as critical. Affected by this vulnerability is the function Base::XMLReader::XMLReader of the file src/Base/Reader.cpp of the component Xerces SAX2 XMLReader. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-73235 since 08/11/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.1.2 eliminates this vulnerability.

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Productinfo

Name

• FreeCAD

Version

• 1.1.0
• 1.1.1

Website

• Product: https://github.com/FreeCAD/FreeCAD/

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