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CVE-2026-40405

HighCVSS 7.5/10Last modified Nov 11, 2026

Description

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.8457
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.8457
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.2113
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32860
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32860

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40405Vendor Advisory

Timeline

Published: May 12, 2026
Last modified: Nov 11, 2026
NVD status: Analyzed

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CVE-2026-40405: High severity, CVSS 7.5 | Vulnix