EUVD-2026-56931Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
File-based local delivery (AV:L), no system privileges needed (PR:N), but victim must open file and actively accept the dialog (UI:R), with full impact on the FreeCAD process.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
FreeCAD is a free and open-source multiplatform 3D parametric modeler. Prior to 1.1.2, the FEM Displacement Constraint task dialog in src/Mod/Fem/Gui/TaskFemConstraintDisplacement.cpp passes the xDisplacementFormula, yDisplacementFormula, and zDisplacementFormula fields of a Fem::ConstraintDisplacement object through TaskDlgFemConstraintDisplacement::accept() into Gui::Command::doCommand. The escaping helper neutralizes quotation marks but not backslashes, allowing crafted formula text to terminate the generated Python string and execute arbitrary Python code with the FreeCAD process's privileges when a victim accepts the dialog. This issue is fixed in version 1.1.2.
Articles & Coverage 1
AnalysisAI
Python code injection in FreeCAD's FEM Displacement Constraint dialog (all versions prior to 1.1.2) enables arbitrary code execution at the FreeCAD process's privilege level when a victim opens and accepts a weaponized project file. The root cause is an incomplete sanitization routine in TaskFemConstraintDisplacement.cpp that strips double-quotes from user-supplied formula fields but leaves backslash characters unhandled, allowing crafted input to escape the Python string boundary constructed by Gui::Command::doCommand(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following: (1) the target system runs FreeCAD prior to version 1.1.2; (2) the victim opens a crafted .FCStd document file - delivery depends on social engineering, phishing, or a compromised shared file location; (3) the victim navigates to a FEM ConstraintDisplacement object within the document and opens its task dialog; (4) the victim clicks Accept (OK/Apply) in the dialog, which triggers TaskDlgFemConstraintDisplacement::accept() and the vulnerable doCommand() call. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 8.5 with AV:L/AC:L/AT:N/PR:N/UI:P reflects the realistic attack model: the attacker needs no system privileges and faces no technical complexity barrier, but the attack is local in vector (requires the victim to open a crafted file) and requires passive user interaction (the victim must accept the dialog). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a FreeCAD project file (.FCStd archive) containing a FEM ConstraintDisplacement object whose xDisplacementFormula property is set to a value such as '\'; import os; os.system("malicious_command"); x = "' - a backslash sequence that escapes the Python string generated by doCommand() and appends arbitrary Python statements. The file is delivered to an engineer via email attachment, Slack share, or a poisoned shared network drive. … |
| Remediation | Upgrade to FreeCAD 1.1.2 or later, which is the vendor-confirmed patched release; the fix is implemented in commits 0a208ac11cfe7b61c424ee4bb79117138ec50ac2 and 3f60d202a8246958232e2fbc74ba38a83483b74e, merged via pull requests #31267 and #31312, available at https://github.com/FreeCAD/FreeCAD/releases/tag/1.1.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Given that publicly available exploit code exists for this vulnerability, immediate action is required despite no confirmed active exploitation. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
View allVendor StatusVendor
SUSE
Severity: ModerateShare
External POC / Exploit Code
Leaving vuln.today