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High severity7.5NVD Advisory· Published May 12, 2026· Updated May 15, 2026

CVE-2026-40405

CVE-2026-40405

Description

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

Affected products

7
  • Microsoft/Windows 11 24h22 versions
    cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*+ 1 more
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*range: <10.0.26100.8390
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*range: <10.0.26100.8390
  • Microsoft/Windows 11 25h22 versions
    cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*+ 1 more
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*range: <10.0.26200.8390
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*range: <10.0.26200.8390
  • Microsoft/Windows 11 26h12 versions
    cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*+ 1 more
    • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*range: <10.0.28000.2113
    • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*range: <10.0.28000.2113
  • Microsoft/Windows Server 2025
    cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
    Range: <10.0.26100.32772

Patches

Vulnerability mechanics

References

1

News mentions

3