CVE-2026-26177: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-26177) involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local authorization and can result in privilege escalation. The CVSS v3.1 vector indicates high complexity (AC:H), low privileges required (PR:L), no user interaction (UI:N), and impacts confidentiality, integrity, and availability (C:H/I:H/A:H). Microsoft has published an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this use-after-free vulnerability to elevate their privileges on the affected system. This could lead to full system compromise, including unauthorized access to sensitive data and system resources, as well as disruption of system availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security update provided by Microsoft as soon as possible to remediate this issue. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26177 for detailed patching instructions.
CVE-2026-26177: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.0high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-26177) involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local authorization and can result in privilege escalation. The CVSS v3.1 vector indicates high complexity (AC:H), low privileges required (PR:L), no user interaction (UI:N), and impacts confidentiality, integrity, and availability (C:H/I:H/A:H). Microsoft has published an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this use-after-free vulnerability to elevate their privileges on the affected system. This could lead to full system compromise, including unauthorized access to sensitive data and system resources, as well as disruption of system availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security update provided by Microsoft as soon as possible to remediate this issue. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26177 for detailed patching instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-02-11T18:33:57.777Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26177","vendor":"Microsoft"}]
Threat ID: 69de7a1b82d89c981fd6a6d9
Added to database: 04/14/2026, 17:32:11 UTC
Last enriched: 06/19/2026, 17:00:32 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 103
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