CVE-2026-6047

Publication date 15 June 2026

Last updated 16 July 2026

Ubuntu priority

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libreoffice	26.04 LTS resolute	Fixed 4:26.2.4.2-0ubuntu0.26.04.2
	25.10 questing	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected

Notes

mdeslaur

This CVE was ommited from the resolute changelog and USN, but is fixed in the version listed below.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libreoffice	Upstream: https://git.libreoffice.org/core/+/107a9ec3301ed4af3ed29c01c5ef6236bfb398a7

Severity score breakdown

CVSS version: CVSS v4.0

Base score 5.4 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Attack requirements	None
Privileges required	None
User interaction	Passive
Vulnerable system - Confidentiality impact	Low
Vulnerable system - Integrity impact	Low
Vulnerable system - Availability impact	High
Subsequent system - Confidentiality impact	None
Subsequent system - Integrity impact	None
Subsequent system - Availability impact	None

Scores

Parameter	Value
Base score	5.4 · Medium
Base + Threat score	-
Base + Environmental score	-
Base + Threat + Environmental score	-

Vector: 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