Microsoft Windows Server 2025 Update Version OS Build 26100.33650
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Update Summary
KB5126646 (OS Build 26100.33650) adds Quick machine recovery, ReFS security controls, ML-KEM support for TLS 1.3, Secure Boot certificate deployment, and quality improvements for Windows Server 2025. Reference IDs: KB5126645.
Update Details
Security
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Bug Fixes
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New Features
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Known Issues
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Hints
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Product Information
Vendor: Microsoft
Product: Windows Server 2025
Product type: Software
Application category: Utilities
Platform: Windows
Version: OS Build 26100.33650
Vendor information published: Oct 13, 2026
Original release notes: View on vendor site
Published on updatealert.io: Oct 14, 2026
Description: Server operating system for next-generation on-premises and hybrid workloads.