CVE-2026-40406 Details
Description
Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
A use-after-free vulnerability has been identified in the Windows TCP/IP stack, which could allow an unauthorized attacker to disclose information over the network. This vulnerability affects several versions of Windows, including various editions of Windows Server, Windows 10, and Windows 11. The exploitation of this vulnerability could lead to the unauthorized disclosure of certain kernel memory contents.
Users can apply the security update for this vulnerability, which is included in the May 2026 security updates. Instructions for downloading the security update are available on the Microsoft Update Catalog.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 1607 | < 10.0.14393.9140 |
CPE
Remediation
| |
| microsoft windows 10 1809 | < 10.0.17763.8755 |
CPE
Remediation
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| microsoft windows 10 21h2 | < 10.0.19044.7291 |
CPE
Remediation
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| microsoft windows 10 22h2 | < 10.0.19045.7291 |
CPE
Remediation
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| microsoft windows 11 23h2 | < 10.0.22631.7079 |
CPE
Remediation
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| microsoft windows 11 24h2 | < 10.0.26100.8390 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.8390 |
CPE
Remediation
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| microsoft windows 11 26h1 | < 10.0.28000.2113 |
CPE
Remediation
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| microsoft windows server 2012 | r2 |
CPE
Remediation
| |
| microsoft windows server 2016 | < 10.0.14393.9140 |
CPE
Remediation
| |
| microsoft windows server 2019 | < 10.0.17763.8755 |
CPE
Remediation
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| microsoft windows server 2022 | < 10.0.20348.5074 |
CPE
Remediation
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| microsoft windows server 2022 23h2 | < 10.0.25398.2330 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32772 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 12, 2026 | New CVE Received | [email protected] |