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

> Attackers can execute arbitrary code by tricking users into opening a crafted FreeCAD document that exploits unsafe Python module imports.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 17 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-34789, GHSA-493w-pp4h-h77v, UBUNTU-CVE-2026-34789

## What is CVE-2026-34789?

CVE-2026-34789 is a high-severity code injection vulnerability in FreeCAD, published on 17 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-34789?


## How do I fix CVE-2026-34789?

Upgrade to a fixed version.

## Is CVE-2026-34789 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34789 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34789 and fix it if it is affected.

What it is: CVE-2026-34789 is a high-severity code injection vulnerability in FreeCAD, published on 17 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34789 exists.

Affected product: FreeCAD. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34789/ (Markdown: https://insights.sbomify.com/CVE-2026-34789/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34789
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34789
- OSV: https://osv.dev/vulnerability/CVE-2026-34789

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-34789/
Summaries are generated and may contain mistakes; the official description above is the record.