# CVE-2026-6045: The Document Foundation LibreOffice heap buffer overflow in EMF+ import

Source: https://junglewise.ai/threats/cve-2026-6045-the-document-foundation-libreoffice-heap-buffer-overflow-in-emf  
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-2026-6045 · 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 types of embedded graphics. An attacker could create a malicious document 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 compromise of the user's workstation.

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-2026-6045 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6045 being exploited in the wild.

**How severe is CVE-2026-6045?** Informational severity, with a CVSS score of 5.4, published 15 June 2026.

**Which products and versions are affected?** The Document Foundation LibreOffice Versions prior to fix (specific fixed versions not listed in text for this CVE).

**Is there a fix for CVE-2026-6045?** 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-2026-6045 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-6045?** Check whether you run The Document Foundation LibreOffice at an affected version. 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 EMF+ graphic import component. The vulnerability is caused by an integer overflow (CWE-190) when calculating the allocation size for gradient blend points. The application reads the number of blend points from a file and multiplies it to determine the buffer size; if this multiplication overflows, a small buffer is allocated. Subsequent data is then written into this undersized buffer, resulting in an out-of-bounds write (CWE-787). An attacker can exploit this by providing a specially crafted document containing a malicious EMF+ image. Fixed versions mitigate this by validating the blend-point count against the actual available data before performing the allocation.

## Affected products

- The Document Foundation LibreOffice Versions prior to fix (specific fixed versions not listed in text for this CVE)

## Timeline

- 2026-06-15: disclosed: CVE published to NVD dataset

## References

- [https://www.libreoffice.org/about-us/security/advisories/cve-2026-6045](https://www.libreoffice.org/about-us/security/advisories/cve-2026-6045)

## Related threats

- [LibreOffice information disclosure via HLS playlist in GStreamer](https://junglewise.ai/threats/cve-2026-63269-libreoffice-can-link-to-audio-and-video-files-from-a-document-and)
- [LibreOffice environment variable and INI file expansion in URLs](https://junglewise.ai/threats/cve-2026-63278-urls-could-be-constructed-which-expanded-environment-variable-or)
- [LibreOffice stack buffer overflow in PPT colour-replacement import](https://junglewise.ai/threats/cve-2026-8356-libreoffice-stack-buffer-overflow-in-ppt-colour-replacement-import)
- [LibreOffice heap buffer overflow in OOXML import](https://junglewise.ai/threats/cve-2026-6047-libreoffice-heap-buffer-overflow-in-ooxml-import)
- [The Document Foundation LibreOffice use-after-free in ODF import](https://junglewise.ai/threats/cve-2026-6040-the-document-foundation-libreoffice-use-after-free-in-odf-import)