CVE-2026-63272
Announced: Sep 21, 2026
Fixed in: LibreOffice 26.2.5
Description:
LibreOffice can import WMF graphics, which may be embedded in documents.
A heap buffer overflow existed when importing a text record that carries its own character advance widths. The count of advance values and the length of the text were read separately from the file and were not required to agree, so drawing the text walked the advance array by character position and ran past its end when the array was the shorter of the two.
In fixed versions an advance array shorter than its text is ignored.
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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