CVE-2026-42915

Published: Jun 9, 2026Modified: Jun 11, 2026

5.7

Vector

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

Exploitability: 2.1 / Impact: 3.6

Source: secure@microsoft.com

Description

Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny service over an adjacent network.

Affected (16)

Products: Microsoft: Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows Server 2022, Windows Server 2025

8 products

Windows 10 21h2

Windows 10 22h2

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows Server 2022

Windows Server 2025

Configuration A

16 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 21h2	Before 10.0.19044.7417
Microsoft Windows 10 21h2	Before 10.0.19044.7417
Microsoft Windows 10 21h2	Before 10.0.19044.7417
Microsoft Windows 10 22h2	Before 10.0.19045.7417
Microsoft Windows 10 22h2	Before 10.0.19045.7417
Microsoft Windows 10 22h2	Before 10.0.19045.7417
Microsoft Windows 11 23h2	Before 10.0.22631.7219
Microsoft Windows 11 23h2	Before 10.0.22631.7219
Microsoft Windows 11 24h2	Before 10.0.26100.8655
Microsoft Windows 11 24h2	Before 10.0.26100.8655
Microsoft Windows 11 25h2	Before 10.0.26200.8655
Microsoft Windows 11 25h2	Before 10.0.26200.8655
Microsoft Windows 11 26h1	Before 10.0.28000.2269
Microsoft Windows 11 26h1	Before 10.0.28000.2269
Microsoft Windows Server 2022	Before 10.0.20348.5256
Microsoft Windows Server 2025	Before 10.0.26100.32995

Related CWEs

Incorrect Calculation of Buffer Size

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42915

Source: secure@microsoft.com

Vendor Advisory

Timeline

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