Detections
Analytics

KB5089548: Windows 11 Version 26H1 Security Update (May 2026)

critical Nessus Plugin ID 314342

Synopsis

The remote Windows host is affected by multiple vulnerabilities.

Description

The remote Windows host is missing security update 5089548. It is, therefore, affected by multiple vulnerabilities

 - Heap-based buffer overflow in Microsoft Windows DNS allows an unauthorized attacker to execute code over a network. (CVE-2026-41096)

 - Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.
 (CVE-2026-40403)

 - Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over an adjacent network. (CVE-2026-34329)

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

Solution

Apply Security Update 5089548

See Also

https://support.microsoft.com/help/5089548

Plugin Details

Severity: Critical

ID: 314342

File Name: smb_nt_ms26_may_5089548.nasl

Version: 1.1

Type: Local

Agent: windows

Published: 5/12/2026

Updated: 5/12/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-41096

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:microsoft:windows_11_26h1

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 5/12/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2025-54518, CVE-2026-21530, CVE-2026-32161, CVE-2026-32170, CVE-2026-32209, CVE-2026-33834, CVE-2026-33835, CVE-2026-33837, CVE-2026-33838, CVE-2026-33839, CVE-2026-33840, CVE-2026-33841, CVE-2026-34329, CVE-2026-34330, CVE-2026-34331, CVE-2026-34333, CVE-2026-34334, CVE-2026-34336, CVE-2026-34337, CVE-2026-34338, CVE-2026-34339, CVE-2026-34340, CVE-2026-34341, CVE-2026-34342, CVE-2026-34343, CVE-2026-34344, CVE-2026-34345, CVE-2026-34347, CVE-2026-34351, CVE-2026-35415, CVE-2026-35416, CVE-2026-35417, CVE-2026-35418, CVE-2026-35419, CVE-2026-35421, CVE-2026-35422, CVE-2026-35423, CVE-2026-35424, CVE-2026-40369, CVE-2026-40377, CVE-2026-40380, CVE-2026-40382, CVE-2026-40397, CVE-2026-40398, CVE-2026-40399, CVE-2026-40401, CVE-2026-40403, CVE-2026-40405, CVE-2026-40406, CVE-2026-40407, CVE-2026-40408, CVE-2026-40410, CVE-2026-40413, CVE-2026-40414, CVE-2026-40415, CVE-2026-41088, CVE-2026-41096, CVE-2026-41097, CVE-2026-42825, CVE-2026-42896

MSFT: MS26-5089548

MSKB: 5089548