CVE-2026-4430: Libreoffice

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters. This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.

Affected products

• Libreoffice Libreoffice: from 25.8.0.0, before 25.8.7.0 (fixed in 25.8.7.0); from 26.2.0.0, before 26.2.3.0 (fixed in 26.2.3.0)

Published 2026-05-07. Last modified 2026-06-17.