Origin validation error in Microsoft Windows and Windows Server - CVE-2026-56179
Published: August 12, 2026
Vulnerability identifier: #VU142000
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56179
CWE-ID: CWE-346
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing.
The vulnerability exists due to origin validation error in Windows Network Address Translation (NAT) when handling network traffic over an adjacent network. A remote attacker can send crafted network traffic to perform spoofing.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-56179
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9106, 11 24H2 10.0.26100.9168, 11 25H2 10.0.26200.9168, 11 26H1 10.0.28000.2704
Windows Server - addressed in versions 2025 10.0.26100.33222, 2025 10.0.26100.33296
Windows Server - addressed in versions 2025 10.0.26100.33222, 2025 10.0.26100.33296