Microsoft releases Windows 10 KB5126657 extended security update

Microsoft released the Windows 10 KB5126657 extended security update, bringing this month's record-breaking October 2026 Patch Tuesday fixes that addressed 1,411 vulnerabilities, including one actively exploited zero-day. After installation, Windows 10 moves to build 19045.7807 and Windows 10 Enterprise LTSC 2021 to build 19044.7807.

• KB5126657 updates Windows 10 to build 19045.7807
• October Patch Tuesday fixed 1,411 vulnerabilities, including an exploited zero-day
• Adds permanent Daylight Savings Time support for British Columbia and Alberta
• Known USB Audio Class 1.0 issue persists with Code 10 errors and audio failures