CVE-2026-6047

Heap buffer overflow in OOXML text box element import

State: Published
Severity: 5.4 Medium
Published: Jun 15, 2026
Updated: Jun 15, 2026
Reserved: Apr 9, 2026

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.

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

Affected Products

Product	Versions
LibreOfficeThe Document Foundation	25.8 to before < 25.8.7Affected 26.2 to before < 26.2.3Affected

References

https://www.libreoffice.org/about-us/security/advisories/cve-2026-6047

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