LibreOffice 25.8.x < 25.8.7 / 26.2.x < 26.2.3 Heap Buffer Overflow (CVE-2026-4430)

medium Nessus Plugin ID 313231

Language:

Synopsis

An application installed on the remote host is affected by a heap buffer overflow vulnerability.

Description

The version of LibreOffice installed on the remote host is prior to 25.8.7 or 26.2.3. It is, therefore, affected by a heap buffer overflow vulnerability:

- An out-of-bounds write vulnerability exists in the AgileEngine component of LibreOffice. An attacker can exploit this by crafting a malicious OOXML document with mismatched encryption salt parameters, potentially leading to arbitrary code execution or application crash when the document is opened. (CVE-2026-4430)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to LibreOffice version 25.8.7 / 26.2.3 or later.

Plugin Details

Severity: Medium

ID: 313231

File Name: libreoffice_26_2_3.nasl

Version: 1.2

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 5/8/2026

Updated: 5/11/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-4430

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.4

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

CPE: cpe:/a:libreoffice:libreoffice

Required KB Items: installed_sw/LibreOffice

Exploit Ease: No known exploits are available

Patch Publication Date: 5/6/2026

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-4430

IAVB: 2026-B-0115

Detections

Analytics