LibreOffice 26.2 Heap Buffer Overflow in PDF Import (before 26.2.5)
CVE-2026-63273 Published on September 22, 2026
Heap buffer overflow in PDF import encryption handling
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.
Vulnerability Analysis
CVE-2026-63273 can be exploited with local system access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-63273 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-63273
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Affected Versions
The Document Foundation LibreOffice:- Version 26.2 and below < 26.2.5 is affected.