CVE-2026-40415 Details
Description
Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
A use-after-free vulnerability has been identified in the Windows TCP/IP stack, allowing an unauthorized attacker to execute code remotely. This vulnerability arises from improper memory management, which can be exploited by sending specially crafted malicious traffic to a vulnerable server. The issue is present in several versions of Windows 10, Windows 11, Windows Server 2019, Windows Server 2022, and Windows Server 2025.
Users can apply the security update for this vulnerability, which is available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles linked in the 'Security Updates' section.
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-2026-40415 | [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 1809 | < 10.0.17763.8755 |
CPE
Remediation
| |
| 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 2019 | < 10.0.17763.8755 |
CPE
Remediation
| |
| microsoft windows server 2022 | < 10.0.20348.5074 |
CPE
Remediation
| |
| 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] |