CVE-2026-56179 json
Windows Network Address Translation (NAT) Spoofing Vulnerability
published 2026-08-11 2 mo ago modified 2026-10-30 10 d ago also EUVD-2026-56763
- cvss
- 8.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.
Patch / fix
- Microsoft Windows 11 Version 24H2 10.0.26100.9168
- Microsoft Windows 11 Version 25H2 10.0.26200.9168
- Microsoft Windows 11 version 26H1 10.0.28000.2704
- Microsoft Windows Server 2025 10.0.26100.33296
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33296
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.3 | 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 |
| CNA | 3.1 | 8.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
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)
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-56179
vendor-advisory, patch
Sources
- CVE List CVE-2026-56179
- NVD CVE-2026-56179
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