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MEDIUM: 5.4 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:PDefault status
unknown
25.8 (25.8 series) before < 25.8.7
affected
26.2 (26.2 series) before < 26.2.3
affected
Description
LibreOffice can import documents in the OOXML format (DOCX). A heap buffer overflow existed when replaying deferred parser events for a text box element. A handler object was assumed to be of one type and written to at that type's field layout, but it could be a smaller object, so the write landed past the end of the allocation. In fixed versions the type is checked before the write.
Problem types
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Product status
25.8 (25.8 series) before < 25.8.7
26.2 (26.2 series) before < 26.2.3
Credits
Anthropic (automated discovery using Claude)
Trail of Bits (triage and validation)
References
www.libreoffice.org/...-us/security/advisories/cve-2026-6047