CVE-2026-63273: The Document Foundation Libreoffice

Medium severity, CVSS 5.4. EPSS: 0.1% chance of exploitation in the next 30 days.

LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being checked against it, so a length larger than that buffer wrote past its end. In fixed versions a declared key length larger than the buffer is rejected.

Affected products

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

Published 2026-09-22. Last modified 2026-09-22.