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 TCP/IP implementation of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). An attacker can exploit this flaw remotely over the network to disclose sensitive information without needing privileges or user interaction. Microsoft has released an official patch to address this issue, as documented in their security update guide.
Potential Impact
Successful exploitation can lead to unauthorized information disclosure over the network. There is no impact on integrity or availability. The vulnerability can be exploited remotely without authentication or user interaction, increasing its risk.
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.
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.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40406) involves a use-after-free condition in the TCP/IP implementation of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). An attacker can exploit this flaw remotely over the network to disclose sensitive information without needing privileges or user interaction. Microsoft has released an official patch to address this issue, as documented in their security update guide.
Potential Impact
Successful exploitation can lead to unauthorized information disclosure over the network. There is no impact on integrity or availability. The vulnerability can be exploited remotely without authentication or user interaction, increasing its risk.
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.
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: 05/12/2026, 17:37:27 UTC
Last enriched: 06/19/2026, 17:39:17 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 116
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