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VULNERABILITIES

CVE-2026-40405 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40405 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-476NULL Pointer Dereference[email protected]

Affected Products

ProductVersions
microsoft windows 11 24h2
< 10.0.26100.8390

CPE

  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*

Remediation

  • No remediation found in references.
microsoft windows 11 25h2
< 10.0.26200.8390

CPE

  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*

Remediation

  • No remediation found in references.
microsoft windows 11 26h1
< 10.0.28000.2113

CPE

  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*

Remediation

  • No remediation found in references.
microsoft windows server 2025
< 10.0.26100.32772

CPE

  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-40405
NVD Published Date:
May 12, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-40405 Details - Not Deferred