VulnerabilityDeferred

CVE-2026-6047

A heap buffer overflow existed when replaying deferred parser events for a text box element.

MEDIUM 5.4EPSS 0.12%

Does this matter?

Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 5.4 MEDIUMCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.12% probability · 2th percentile
CISA KEV: Not listed
Weakness: CWE-787, CWE-843
Source: security@documentfoundation.org

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.