CVE-2026-8356
Announced: Jun 15, 2026
Fixed in: LibreOffice 26.2.4
Description:
A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack.
In fixed versions the unused second pass is no longer read into those tables.
All users are recommended to upgrade to LibreOffice >= 26.2.4 to avoid this problem.
Credits:
Thanks to Anthropic for discovering this issue using automated analysis with Claude.
Thanks to Arthur Chan of Ada Logics for validating and reporting this issue.
Thanks to Caolán McNamara of Collabora Productivity for providing a fix.
References:
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