CVE-2026-40406: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40406) involves a use-after-free condition in the Windows TCP/IP implementation on Windows 10 Version 1607. An attacker can exploit this flaw remotely over the network to gain unauthorized information disclosure. The CVSS v3.1 base score is 7.5, reflecting high severity due to network attack vector, no privileges or user interaction needed, and high confidentiality impact. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to disclose sensitive information from the affected system remotely. The integrity and availability of the system are not impacted. There are no reports of active exploitation in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
CVE-2026-40406: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40406) involves a use-after-free condition in the Windows TCP/IP implementation on Windows 10 Version 1607. An attacker can exploit this flaw remotely over the network to gain unauthorized information disclosure. The CVSS v3.1 base score is 7.5, reflecting high severity due to network attack vector, no privileges or user interaction needed, and high confidentiality impact. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to disclose sensitive information from the affected system remotely. The integrity and availability of the system are not impacted. There are no reports of active exploitation in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406","vendor":"Microsoft"}]
Threat ID: 6a036557cbff5d861008c9be
Added to database: 5/12/2026, 5:37:27 PM
Last enriched: 5/12/2026, 6:23:54 PM
Last updated: 5/13/2026, 4:48:46 AM
Views: 2
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