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CVE-2026-40406

nvd nist
Published: May 12, 2026Modified: Jun 17, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitability: 3.9 / Impact: 3.6
Source: secure@microsoft.com (Secondary)

Description

Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.

Affected (25)

Microsoft
14 products
Windows 10 1607
Windows 10 1809
Windows 10 21h2
Windows 10 22h2
Windows 11 23h2
Windows 11 24h2
Windows 11 25h2
Windows 11 26h1
Windows Server 2012
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2022 23h2
Windows Server 2025
Configuration A
25 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
Windows 10 1607
Before 10.0.14393.9140
Windows 10 1607
Before 10.0.14393.9140
Microsoft
Windows 10 1809
Before 10.0.17763.8755
Windows 10 1809
Before 10.0.17763.8755
Microsoft
Windows 10 21h2
Before 10.0.19044.7291
Windows 10 21h2
Before 10.0.19044.7291
Windows 10 21h2
Before 10.0.19044.7291
Microsoft
Windows 10 22h2
Before 10.0.19045.7291
Windows 10 22h2
Before 10.0.19045.7291
Windows 10 22h2
Before 10.0.19045.7291
Microsoft
Windows 11 23h2
Before 10.0.22631.7079
Windows 11 23h2
Before 10.0.22631.7079
Microsoft
Windows 11 24h2
Before 10.0.26100.8390
Windows 11 24h2
Before 10.0.26100.8390
Microsoft
Windows 11 25h2
Before 10.0.26200.8390
Windows 11 25h2
Before 10.0.26200.8390
Microsoft
Windows 11 26h1
Before 10.0.28000.2113
Windows 11 26h1
Before 10.0.28000.2113
Microsoft
Windows Server 2012
All versions
Windows Server 2012
Version r2
Windows Server 2016
Before 10.0.14393.9140
Windows Server 2019
Before 10.0.17763.8755
Windows Server 2022
Before 10.0.20348.5074
Windows Server 2022 23h2
Before 10.0.25398.2330
Windows Server 2025
Before 10.0.26100.32772

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.