CVE-2026-56181 HIGH

CVE-2026-56181: Windows Network Address Translation (NAT) Spoofing Vulnerability

Vendor Microsoft
Product Windows 11 Version 24H2
Weakness CWE-346 · Origin validation
Published July 14, 2026
Last update July 24, 2026
View on NVD All CVEs

CVSS base score

8.3/10
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

July 14, 2026 CVE published
July 24, 2026 Record updated