CVE-2026-63274
Announced: Sep 21, 2026
Fixed in: LibreOffice 26.2.5
Description:
LibreOffice Draw can import PDF documents.
A heap buffer overflow existed when importing a stream object. The length of the stream was taken from the object’s own dictionary and was not checked against the number of bytes actually present, so copying the stream read and wrote past the end of the buffer holding it.
In fixed versions the declared length is clamped to the bytes actually read.
All users are recommended to upgrade to LibreOffice >= 26.2.5 to avoid this problem.
Credits:
Thanks to Claude and Ada Logics – found by Anthropic using agents to study the security of open-source projects, with Ada Logics validating and reporting.
Thanks to Caolán McNamara of Collabora Productivity for providing the fix.
References:
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