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Microsoft Security Response CenterCVE-2026-105005

Windows Schannel Remote Code Execution Vulnerability

HighVendor CVSS 8.1 / 10 1 CVE Published Oct 13, 2026 at 7:00 AM UTC

Summary

Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a network.

Products covered

  • Windows 11 Version 26H1 for ARM64-based Systems

  • Windows 11 version 26H1 for x64-based Systems

Remediation

Install KB5127646.

Vendor-listed fixes

  • 10.0.28000.3231

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.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.