Loading vulnerability…
CVE-2026-56179 is a high-severity spoofing vulnerability in Windows Network Address Translation (NAT). The flaw is caused by an origin validation error, meaning the component does not correctly validate the true source of network-originated traffic under certain conditions. Microsoft indicates that exploitation is possible by an unauthorized attacker over an adjacent network. The issue affects multiple supported Windows client and server releases, including Windows 11 24H2, 25H2, and 26H1, as well as Windows Server 2025 and Windows Server 2025 Server Core. The published CVSS v3.1 vector is AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H, reflecting adjacent-network reachability, no required privileges, no user interaction, and potentially broad downstream security impact.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.