8.3
High
CVE-2026-56179 Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing…
Description
Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 11 Version 24H2 10.0 | 10.0.26100.0 → < 10.0.26100.9168 | 10.0.26100.9168 |
| Windows 11 Version 25H2 10.0 | 10.0.26200.0 → < 10.0.26200.9168 | 10.0.26200.9168 |
| Windows 11 version 26H1 10.0 | 10.0.28000.0 → < 10.0.28000.2704 | 10.0.28000.2704 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.33296 | 10.0.26100.33296 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.33296 | 10.0.26100.33296 |
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