CVE-2026-63277: The Document Foundation Libreoffice

High severity, CVSS 8.5. EPSS: 0.1% chance of exploitation in the next 30 days.

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. A document could name a Java database driver for such a link to be loaded from a remote location, so opening the document could run Java code from that location. In fixed versions an entry in a Java class path has to be a file URL.

Affected products

• The Document Foundation Libreoffice: from 26.2, before 26.2.5 (fixed in 26.2.5)

Published 2026-10-05. Last modified 2026-10-06.