CVE-2026-56179

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

Scoring

Severity

HIGH

CVSS base score

8.3

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

EPSS probability

0.23%

CWE

CWE-346

Published

2026-08-11

Last modified

2026-09-16

Affected products

• Microsoft Windows 11 Version 24H2
• Microsoft Windows 11 Version 25H2
• Microsoft Windows 11 version 26H1
• Microsoft Windows Server 2025
• Microsoft Windows Server 2025 (Server Core installation)

Weakness type

• CWE-346

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