Windows updates
The latest version of Windows is 28000.3231, which Microsoft released on 13 Oct 2026. It fixes 997 security flaws.[1] One of the flaws it fixes is already being used in attacks.
Since June 2026, Microsoft has put out 23 Windows security releases, closing 4 flaws that attackers were already using.
Should you update your PC?
Yes, today. KB5127646 came out on 13 Oct 2026. It fixes a flaw already being used in attacks, so install it today. Its page lists what each fix covers. Not ready for Windows 11 26H1, or on a device that can’t run it? KB5127648 has the fixes for Windows 11 24H2.
Older devices
Microsoft keeps fixing older versions for devices that can’t run the newest one. The newest release on each:
How to update
- Save your work first.Windows restarts to finish the update, once or twice.
- Open Start → Settings → Windows Update.Select Check for updates. Windows downloads the month’s cumulative update; it includes every earlier fix.
- Restart when it asks.Select Restart now, or schedule it for tonight. Until it restarts, the fixes aren’t in place.
- Leave automatic updates on.In the same place, under Advanced options, turn on “Get me up to date” so restarts don’t wait for days.
To see which version you have: Press Windows key + R, type winver and press Enter: it shows the OS build.
Every release
Every Windows security release since June 2026, newest first.
| Release | Date | Fixes | Used in attacks |
|---|---|---|---|
| KB5127646 | 997 | 1 | |
| KB5127648 | 1,009 | 1 | |
| KB5126653 | 965 | 1 | |
| KB5126657 | 899 | 1 | |
| KB5129194 | 2 | – | |
| KB5129195 | 1 | – | |
| KB5124012 | 637 | 1 | |
| KB5124008 | 638 | 1 | |
| KB5122880 | 611 | 1 | |
| KB5122878 | 575 | 1 | |
| KB5121000 | 183 | 1 | |
| KB5121003 | 182 | 1 | |
| KB5123273 | 1 | – | |
| KB5120240 | 160 | 1 | |
| KB5120249 | 150 | 1 | |
| KB5101649 | 376 | – | |
| KB5101650 | 373 | – | |
| KB5099414 | 18 | – | |
| KB5099539 | 309 | – | |
| KB5095051 | 118 | – | |
| KB5094126 | 106 | – | |
| KB5093998 | 102 | – | |
| KB5094127 | 93 | – |
References
- ^ Microsoft. “Security Update Guide”, each release’s notes.