CVE-2026-56179CWE-346

CVE-2026-56179

High · published August 11, 2026

CVSS v3.1
8.3
EPSS
0%
Percentile
19.0
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.3 · HIGH
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00276 · 19.0th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-08-11T21:18Z
Affected products (7)
ProductVersionsFixed in
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_server_2025< 10.0.26100.3322210.0.26100.33222
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56179 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:07Z
    Windows Network Address Translation (NAT) Spoofing Vulnerability
    cvelistv5