CVE-2026-6045: The Document Foundation Libreoffice

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

LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.

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.