CVE intelligence

CVE-2026-56181

Vulnerability intelligence

Published Jul 14, 2026Sources checked Nov 12, 2026

8.3HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-56181 and is rated High severity with a CVSS score of 8.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Jul 14, 2026

Vendor remediation details

The mitigation is disabled by default. To enable it, apply the following registry key and reboot the machine. reg add HKLM\SYSTEM\CurrentControlSet\Services\Winnat /v DisableFailOver /t REG_DWORD /d 1 /f Install KB5099536. Install KB5101650. Install KB5101649.

Vendor-listed releases

10.0.26100.33158
10.0.26200.8875
10.0.26100.8875
10.0.28000.2525

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-56181?

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

Source: NVD