CVE-2026-69374

Windows SMB Server Denial of Service Vulnerability

CVE-2026-69374 is fixed in 18 products on 1 platform, first by KB5122878, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0114

66th percentile

<p>Allocation of resources without limits or throttling in Windows SMB Server allows an authorized attacker to deny service over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 21H2 for 32-bit Systems		KB5122878	Sep 8, 2026
Windows 10 Version 21H2 for ARM64-based Systems		KB5122878	Sep 8, 2026
Windows 10 Version 21H2 for x64-based Systems		KB5122878	Sep 8, 2026
Windows 10 Version 22H2 for 32-bit Systems		KB5122878	Sep 8, 2026
Windows 10 Version 22H2 for ARM64-based Systems		KB5122878	Sep 8, 2026
Windows 10 Version 22H2 for x64-based Systems		KB5122878	Sep 8, 2026
Windows 11 Version 23H2 for ARM64-based Systems	22631.7582	KB5122880	Sep 8, 2026
Windows 11 Version 23H2 for x64-based Systems	22631.7582	KB5122880	Sep 8, 2026
Windows 11 Version 24H2 for ARM64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 24H2 for x64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 25H2 for ARM64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 25H2 for x64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 26H1 for ARM64-based Systems	28000.2954	KB5124012	Sep 8, 2026
Windows 11 version 26H1 for x64-based Systems	28000.2954	KB5124012	Sep 8, 2026
Windows Server 2022	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2022 (Server Core installation)	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2025	26100.33438	KB5122871	Sep 8, 2026
Windows Server 2025 (Server Core installation)	26100.33438	KB5122871	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Allocation of Resources Without Limits or Throttling
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69374

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