CVE-2026-63273
Heap buffer overflow in PDF import encryption handling
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | the document foundation |
| Product | libreoffice |
| Published | Sep 22, 2026 |
| Last Updated | Sep 22, 2026 |
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Affected Versions
The Document Foundation / LibreOffice
26.2 < < 26.2.5
References
Credits
Claude, found by Anthropic using agents to study the security of open-source projects Ada Logics, validating and reporting Caolán McNamara of Collabora Productivity