CVE-2026-56181

Summary

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

Affected Software

VendorProductVersion RangeStatus
MicrosoftWindows 11 Version 24H210.0.26100.0 < 10.0.26100.8875affected
MicrosoftWindows 11 Version 25H210.0.26200.0 < 10.0.26100.8875affected
MicrosoftWindows 11 version 26H110.0.28000.0 < 10.0.28000.2525affected
MicrosoftWindows Server 202510.0.26100.0 < 10.0.26100.33158affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 < 10.0.26100.33158affected

Weaknesses

  • CWE-346: CWE-346: Origin Validation Error

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References