CVE-2026-6047: The Document Foundation Libreoffice

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

LibreOffice can import documents in the OOXML format (DOCX). A heap buffer overflow existed when replaying deferred parser events for a text box element. A handler object was assumed to be of one type and written to at that type's field layout, but it could be a smaller object, so the write landed past the end of the allocation. In fixed versions the type is checked before the write.

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.