CVE-2026-6039

Announced: Jun 15, 2026

Fixed in: LibreOffice 26.2.3 and LibreOffice 25.8.7

Description:

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.

All users are recommended to upgrade to LibreOffice >= 26.2.3 or >= 25.8.7 to avoid this problem.

Credits:

Thanks to Anthropic for discovering this issue using automated analysis with Claude.

Thanks to Trail of Bits for triaging and validating this issue.

Thanks to Caolán McNamara of Collabora Productivity for providing a fix.

References:

CVE-2026-6039

CVE-2026-6039

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