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KB5120996DOptional non-security preview · 2026-08 D

Optional non-security preview for Windows 11, version 26H1

Support article Update Catalog CVEs in Security CVE list for a ticket

Is it safe to deploy?

SupersededKB5120996D

Deploy KB5129194 instead; it includes these fixes.

UrgencyCritical · 1 exploited RiskModerate · 1 mitigated
Everything in the August 2026 Patch Tuesday cycle
1Windows version
0CVEs fixed · 0 critical
0Exploited or in CISA KEV
1Open known issues affecting it
—Restart required (per MSRC)

Applies to

From Microsoft's release-information tables
Servicing branchOS buildReleaseAvailable
Windows 11, version 26H1 28000.2804 D 2026-08 D 27 Aug 2026

Known issues in this update

Windows release health

Issues this update resolves

No resolved issues listed

Windows release health names no issues fixed by this KB.

Security fixes

0 Microsoft CVEs · most urgent first

No CVE fixes listed

MSRC lists no CVEs for this KB in the collected releases; preview (D) and out-of-band updates often carry no new security fixes.

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