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CVE-2026-56179

HighCVSS 8.3/10Last modified Aug 13, 2026

Description

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

Metrics

CVSS 3.1 8.3/10CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.9168
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.9168
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.2704
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33296
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33296

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56179Patch, Vendor Advisory

Timeline

Published: Aug 11, 2026
Last modified: Aug 13, 2026
NVD status: Analyzed

Related CVEs from 2026

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CVE-2026-56179: High severity, CVSS 8.3 | Vulnix