Information Disclosure Vulnerability in Windows TCP/IP by Microsoft
CVE-2026-40406

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40406?

A vulnerability in Windows TCP/IP allows an unauthorized attacker to exploit a use-after-free condition, potentially leading to information disclosure. This flaw can enable malicious actors to gain access to sensitive data transmitted over a network, posing significant risks to users' information security. It is crucial for users and organizations to apply necessary patches and updates to mitigate the risks associated with this vulnerability.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9140

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8755

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7291

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.