CVE-2026-56181
Microsoft Windows 11 Version 24H2VulnerabilityCVSS 8.3
Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.
No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.
Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.
Severity metrics
CVSS 3.1 : 8.3 HIGH
Attack vectorAdjacent network
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Vector: AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected & fixed versions by distribution
Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.
No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.