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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.

PUBLISHED Reserved 2026-05-11 | Published 2026-06-15 | Updated 2026-06-16 | Assigner Document Fdn.




MEDIUM: 5.4CVSS: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

Problem types

CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

CWE-787 Out-of-bounds Write

Product status

Default status
unknown

25.8 (26.2 series) before < 25.8.7
affected

26.2 (26.2 series) before < 26.2.4
affected

Credits

Anthropic (automated discovery using Claude) finder

Arthur Chan of Ada Logics (validation and reporting) analyst

References

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

cve.org (CVE-2026-8358)

nvd.nist.gov (CVE-2026-8358)

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