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It fixes actively exploited vulnerabilities. Deploy as soon as possible.
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Windows and .NET Framework are serviced separately. These packages target the same Windows version; choose the framework packages that apply to your installation.
Companion updates do not replace this KB or establish an installation prerequisite.
MSRC lists no CVEs under this KB itself; it includes the security fixes of KB5127646 (997 CVEs). Windows release health lists no known issues from this update or the one it builds on, and none it resolves.
| Servicing branch | OS build | Release | Available |
|---|---|---|---|
| Windows 11, version 26H1 | 28000.3237 | OOB 2026-10 OOB | 26 Oct 2026 |
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