CVE-2026-40405

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

Score

CVSS 3.1 7.5 High

Status

Analyzed - secure@microsoft.com

Published

2026-05-12

Last modified

2026-08-10

Weaknesses

CWE-476

Affected products

• Windows 11 24H2 (Microsoft)
• Windows 11 24h2 (Microsoft)
• Windows 11 25H2 (Microsoft)
• Windows 11 25h2 (Microsoft)
• Windows 11 26H1 (Microsoft)
• Windows 11 26h1 (Microsoft)
• Windows Server 2025 (Microsoft)

References

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