CVE-2026-4430

Publication date 7 May 2026

Last updated 5 June 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters. This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libreoffice	26.04 LTS resolute	Fixed 4:26.2.3.2-0ubuntu0.26.04.1
	25.10 questing	Fixed 4:25.8.7-0ubuntu0.25.10.1
	24.04 LTS noble	Fixed 4:24.2.7-0ubuntu0.24.04.5
	22.04 LTS jammy	Fixed 1:7.3.7-0ubuntu0.22.04.11
	20.04 LTS focal	Needs evaluation

Severity score breakdown

CVSS version:

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

Base score 7.8 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-8340-1
LibreOffice vulnerability
28 May 2026

USN-8352-1
LibreOffice vulnerability
1 June 2026