CVE-2025-26634

Published: Mar 11, 2025Modified: Jun 17, 2026

7.5

Vector

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

Exploitability: 1.6 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges over a network.

Affected (13)

Products: Microsoft: Windows 10 1507, Windows 10 1607, Windows 10 21h2, Windows 10 22h2, Windows 11 22h2, Windows 11 23h2, Windows 11 24h2, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2, Windows Server 2025

12 products

Windows 10 1507

Windows 10 1607

Windows 10 21h2

Windows 10 22h2

Windows 11 22h2

Windows 11 23h2

Windows 11 24h2

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Windows Server 2025

Configuration A

13 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1507	version < 10.0.10240.20915
Microsoft Windows 10 1607	version < 10.0.14393.7785
Microsoft Windows 10 1607	version < 10.0.14393.7785
Microsoft Windows 10 21h2	version < 10.0.19044.5487
Microsoft Windows 10 22h2	version < 10.0.19045.5487
Microsoft Windows 11 22h2	version < 10.0.22621.4890
Microsoft Windows 11 23h2	version < 10.0.22631.4890
Microsoft Windows 11 24h2	version < 10.0.26100.3194
Microsoft Windows Server 2016	version < 10.0.14393.7785
Microsoft Windows Server 2019	version < 10.0.17763.6893
Microsoft Windows Server 2022	version < 10.0.20348.3207
Microsoft Windows Server 2022 23h2	version < 10.0.25398.1425
Microsoft Windows Server 2025	version < 10.0.26100.3194

Related CWEs

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26634

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.