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Microsoft Security Response CenterCVE-2026-112971

Windows SMB Client Elevation of Privilege Vulnerability

HighVendor CVSS 7.0 / 10 1 CVE Published Nov 10, 2026 at 8:00 AM UTC

Summary

Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.

Products covered

  • Windows 11 Version 26H1 for ARM64-based Systems

  • Windows 11 version 26H1 for x64-based Systems

Remediation

Install KB5132059.

Vendor-listed fixes

  • 10.0.28000.3501

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.