# CVE-2026-34399: FreeCAD: Arbitrary Code Execution via eval() on untrusted SVG template scale field in BIM TechDraw Page

> Attackers can execute arbitrary Python code by tricking users into opening malicious SVG templates in FreeCAD's BIM Workbench.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/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-2026-34399, GHSA-chv4-vm6r-wjqj, UBUNTU-CVE-2026-34399

## What is CVE-2026-34399?

CVE-2026-34399 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. From 0.19 until 1.1.1, FreeCAD's BIM Workbench contains an eval() call on untrusted data from SVG template files. When a user creates a TechDraw page from a malicious SVG template, arbitrary Python code executes. The vulnerable code is in src/Mod/BIM/bimcommands/BimTDPage.py (line 87). This issue is fixed in version 1.1.1.

Weakness: CWE-95 (Improper Neutralization of Directives in Dynamically Evaluated Code)

## Which versions are affected by CVE-2026-34399?


## How do I fix CVE-2026-34399?

Upgrade to a fixed version.

## Is CVE-2026-34399 being exploited?

There is no known exploitation of CVE-2026-34399 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34399 and fix it if it is affected.

What it is: CVE-2026-34399 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: There is no known exploitation of CVE-2026-34399 in the wild and no public exploit code.

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-2026-34399/ (Markdown: https://insights.sbomify.com/CVE-2026-34399/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34399
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34399
- OSV: https://osv.dev/vulnerability/CVE-2026-34399

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-34399/
Summaries are generated and may contain mistakes; the official description above is the record.