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Δ / VULNERABILITY RECORD

CVE-2026-56179.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 8.3No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Aug 11, 2026

Disclosure summary

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

Source-reported weakness categories

CWE-346

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Aug

Open original source · Updated Aug 11, 2026

Windows Network Address Translation (NAT) Spoofing Vulnerability

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 8.3

VendorProduct / associationVersion / bounds
Microsoft update guideWindows Server 2025 (Server Core installation) (MSRC status code 3)
Microsoft update guideWindows 11 Version 25H2 for ARM64-based Systems (MSRC status code 3)
Microsoft update guideWindows 11 Version 25H2 for x64-based Systems (MSRC status code 3)
Microsoft update guideWindows 11 Version 24H2 for ARM64-based Systems (MSRC status code 3)
Microsoft update guideWindows 11 Version 24H2 for x64-based Systems (MSRC status code 3)
Microsoft update guideWindows Server 2025 (MSRC status code 3)
Microsoft update guideWindows 11 version 26H1 for x64-based Systems (MSRC status code 3)
Microsoft update guideWindows 11 Version 26H1 for ARM64-based Systems (MSRC status code 3)

Vendor remediation references

  • 5120233 · build 10.0.26100.33296 · product IDs 12437, 12436
  • Vendor guidance · product IDs 12437, 12436
  • 5120233 · product IDs 12437, 12436
  • 5120228 · build 10.0.26100.33222 · product IDs 12437, 12436
  • Vendor guidance · product IDs 12437, 12436
  • 5120228 · product IDs 12437, 12436
  • 5121003 · build 10.0.26200.9168 · product IDs 20437, 20438
  • Vendor guidance · product IDs 20437, 20438
  • 5120994 · build 10.0.26200.9106 · product IDs 20437, 20438
  • Vendor guidance · product IDs 20437, 20438
  • 5121003 · build 10.0.26100.9168 · product IDs 12389, 12390
  • Vendor guidance · product IDs 12389, 12390
  • 5120994 · build 10.0.26100.9106 · product IDs 12389, 12390
  • Vendor guidance · product IDs 12389, 12390
  • 5121000 · build 10.0.28000.2704 · product IDs 20853, 20854
  • Vendor guidance · product IDs 20853, 20854
  • The mitigation is disabled by default. To enable it, apply the following registry keys and reboot the machine. reg add HKLM\SYSTEM\CurrentControlSet\Services\Winnat /v TcpSeqValida

Original records & references

PUBLISHED 2026-08-11T03:00:00-04:00
MODIFIED 2026-08-11T03:00:00-04:00
INGESTED 2026-10-08T12:40:33-04:00