CVE-2026-8358

Heap buffer overflow in spreadsheet tracked-changes import

State: Published
Severity: 5.4 Medium
Published: Jun 15, 2026
Updated: Jun 16, 2026
Reserved: May 11, 2026

Description

LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the same change identifier for two different kinds of change. The importer then treated one change object as a different, larger type and wrote past the end of its allocation. In fixed versions records with a duplicate identifier are rejected.

Scores

CVSS	Score	Vector	Source
4.0	5.4 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P	Document Fdn.

Weaknesses

CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
LibreOfficeThe Document Foundation	25.8 to before < 25.8.7Affected 26.2 to before < 26.2.4Affected

References

https://www.libreoffice.org/about-us/security/advisories/cve-2026-8358

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