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Windows build 26200.6899: October 2025 monthly security update (KB5066835)

Windows Build Decoder: What a Windows build number means: 10.0.26100.2314 is Windows 11 24H2 with the November 2024 update. Version, KB, support dates, updates behind.

Paste a Windows build number from winver, ver, a system inventory or a vulnerability scan: 10.0.26100.2314, 19045.5487, Microsoft Windows [Version 10.0.22631.4460], a KB number or a version like 22H2. You get the Windows version (the same build is often a client and a server release), the cumulative update it has, how many monthly security updates behind it is, and how long that version gets updates. Versions, updates and dates come from Microsoft's release information for Windows 11, Windows 10 and Windows Server, read 2026-10-28.

Try: 10.0.26100.2314, 19045.5487, 22631.4460, 20348, 17763, KB5046617, 22H2

Windows 11, version 25H2

Build 26200, first released 2025-09-30

26200.6899 is the October 2025 monthly security update (a hotpatch baseline), released 2025-10-14 as KB5066835 (download).

18 monthly security updates behind. The latest is 26200.9818 (2026-10 D, 2026-10-28).

Support

Home, Pro, Pro Education, and Pro for Workstations
Updated
Until 2027-10-12
Enterprise, Education, IoT Enterprise, and Enterprise multi-session
Updated
Until 2028-10-10
All 40 updates for build 26200
BuildUpdateReleasedKB
26200.9818 2026-10 Doptional non-security preview 2026-10-28 KB5127936
26200.9725 2026-10 OOBout-of-band update 2026-10-26 KB5134133
26200.9711 2026-10 Bmonthly security update 2026-10-13 KB5127648
26200.9550 2026-09 Doptional non-security preview 2026-09-22 KB5124010
26200.9457 2026-09 OOBout-of-band update 2026-09-14 KB5129195
26200.9445 2026-09 Bmonthly security update 2026-09-08 KB5124008
26200.9278 2026-08 Doptional non-security preview 2026-08-27 KB5120998
26200.9168 2026-08 Bmonthly security update 2026-08-11 KB5121003
26200.9106 2026-08 Bhotpatch security update (no restart) 2026-08-11 KB5120994
26200.8973 2026-07 Doptional non-security preview 2026-07-28 KB5101684
26200.8894 2026-07 OOBout-of-band update 2026-07-18 KB5121767
26200.8875 2026-07 Bmonthly security update 2026-07-14 KB5101650
26200.8737 2026-06 Doptional non-security preview 2026-06-23 KB5095093
26200.8655 2026-06 Bmonthly security update 2026-06-09 KB5094126
26200.8524 2026-05 Doptional non-security preview 2026-05-26 KB5089573
26200.8457 2026-05 Bmonthly security update 2026-05-12 KB5089549
26200.8390 2026-05 Bhotpatch security update (no restart) 2026-05-12 KB5089466
26200.8328 2026-04 Doptional non-security preview 2026-04-30 KB5083631
26200.8246 2026-04 Bmonthly security update 2026-04-14 KB5083769
26200.8117 2026-03 OOBout-of-band update 2026-03-31 KB5086672
26200.8116 2026-03 Doptional non-security preview 2026-03-26 KB5079391
26200.8039 2026-03 OOBout-of-band update 2026-03-21 KB5085516
26200.8037 2026-03 Bmonthly security update 2026-03-10 KB5079473
26200.7979 2026-03 Bhotpatch security update (no restart) 2026-03-10 KB5079420
26200.7922 2026-02 Doptional non-security preview 2026-02-24 KB5077241
26200.7840 2026-02 Bmonthly security update 2026-02-10 KB5077181
26200.7781 2026-02 Bhotpatch security update (no restart) 2026-02-10 KB5077212
26200.7705 2026-01 Doptional non-security preview 2026-01-29 KB5074105
26200.7628 2026-01 OOBout-of-band update 2026-01-24 KB5078127
26200.7627 2026-01 OOBout-of-band update 2026-01-17 KB5077744
26200.7623 2026-01 Bmonthly security update 2026-01-13 KB5074109
26200.7462 2025-12 Bmonthly security update 2025-12-09 KB5072033
26200.7392 2025-12 Bhotpatch security update (no restart) 2025-12-09 KB5072014
26200.7309 2025-11 Doptional non-security preview 2025-12-01 KB5070311
26200.7171 2025-11 Bmonthly security update 2025-11-11 KB5068861
26200.7092 2025-11 Bhotpatch security update (no restart) 2025-11-11 KB5068966
26200.7019 2025-10 Doptional non-security preview 2025-10-28 KB5067036
26200.6901 2025-10 OOBout-of-band update 2025-10-20 KB5070773
26200.6899 2025-10 Bmonthly security update 2025-10-14 KB5066835
26200.6584 initial release 2025-09-30