# CVE-2026-6039: The Document Foundation LibreOffice heap overflow in DXF import

Source: https://junglewise.ai/threats/cve-2026-6039-the-document-foundation-libreoffice-heap-overflow-in-dxf-import  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-15. Updated: 2026-06-15  
License: CC BY 4.0 with a link back

CVE-2026-6039 · Severity: info · CVSS 5.4 · Published 2026-06-15

LibreOffice, a popular open-source office productivity suite, is vulnerable to a memory corruption issue when processing certain drawing files. An attacker could create a specially crafted DXF file (a format used by CAD software) that, when opened by a user, causes the application to crash or potentially allows for unauthorized code execution. This could lead to a loss of data or a disruption of business operations if malicious files are distributed to employees.

Technologies: [The Document Foundation LibreOffice](https://junglewise.ai/threats/technologies/libreoffice). Vendors: [The Document Foundation](https://junglewise.ai/threats/vendors/the-document-foundation).

## Quick answers

**Is CVE-2026-6039 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6039 being exploited in the wild.

**How severe is CVE-2026-6039?** Informational severity, with a CVSS score of 5.4, published 15 June 2026.

**Which products and versions are affected?** The Document Foundation LibreOffice.

**Is there a fix for CVE-2026-6039?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-6039 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-6039?** Check whether you run The Document Foundation LibreOffice. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap buffer overflow exists in LibreOffice's DXF (Drawing Exchange Format) import component. The vulnerability is caused by a numeric truncation error (CWE-197) where the point count for a polyline is truncated to a 16-bit value when allocating the point buffer, but the original, larger count is used when filling the buffer. This results in an out-of-bounds write (CWE-787) past the end of the heap-allocated memory. An attacker can exploit this by inducing a user to open a maliciously crafted DXF file. Successful exploitation can lead to a denial of service (application crash) or potentially arbitrary code execution in the context of the user. The issue is addressed in fixed versions by rejecting polylines with oversized point counts.

## Affected products

- The Document Foundation LibreOffice

## Timeline

- 2026-06-15: disclosed
- 2026-06-15: advisory

## References

- [https://www.libreoffice.org/about-us/security/advisories/cve-2026-6039](https://www.libreoffice.org/about-us/security/advisories/cve-2026-6039)

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