High [CVE-2026-56179] Windows Network Address Translation (NAT) Spoofing Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-56179 affecting Windows Server 2025 (Server Core installation).
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Summary
Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.
Affected products named by the advisory: Windows Server 2025; Windows Server 2025 (Server Core installation).
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9168
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9168
- Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2704
- Windows Server 2025 10.0.26100.0 before 10.0.26100.33296
- Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.33296
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 10.0.26100.9168
- 10.0.26200.9168
- 10.0.28000.2704
- 10.0.26100.33296
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 10.0.26100.9168, 10.0.26200.9168, 10.0.28000.2704, 10.0.26100.33296. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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