CVE-2026-6039: The Document Foundation Libreoffice

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

LibreOffice can import drawings in the DXF format used by CAD software. A heap buffer overflow existed when importing a DXF polyline. The point count taken from the file was truncated to a 16-bit value when the point buffer was sized, while the full count was used to fill it, so a polyline whose point count exceeded the 16-bit range was written past the end of the buffer. In fixed versions such oversized polylines are rejected.

Affected products

• The Document Foundation Libreoffice: from 25.8, before 25.8.7 (fixed in 25.8.7); from 26.2, before 26.2.3 (fixed in 26.2.3)

Published 2026-06-15. Last modified 2026-06-17.