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Description

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

PUBLISHED Reserved 2026-06-19 | Published 2026-07-14 | Updated 2026-07-14 | Assigner microsoft




HIGH: 8.3CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-346: Origin Validation Error

Product status

10.0.26100.0 (custom) before 10.0.26100.8875
affected

10.0.26200.0 (custom) before 10.0.26100.8875
affected

10.0.28000.0 (custom) before 10.0.28000.2525
affected

10.0.26100.0 (custom) before 10.0.26100.33158
affected

10.0.26100.0 (custom) before 10.0.26100.33158
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56181 (Windows Network Address Translation (NAT) Spoofing Vulnerability) vendor-advisory patch

cve.org (CVE-2026-56181)

nvd.nist.gov (CVE-2026-56181)

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