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CVE-2026-40401 is a denial-of-service vulnerability in the Windows TCP/IP component caused by a NULL pointer dereference. According to Microsoft, an unauthorized attacker can trigger the flaw locally with low attack complexity, no privileges, and no user interaction. The advisory further notes a scope-change scenario in which a low-privilege Hyper-V guest can cross the guest boundary and trigger denial of service in the Hyper-V host environment. No confidentiality or integrity impact has been reported; the issue affects availability.
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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.
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.
1 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.