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CVE-2026-40413 is a denial-of-service vulnerability in the Windows TCP/IP stack caused by a NULL pointer dereference. An unauthorized attacker on an adjacent network can trigger the flaw without user interaction, causing the affected system's networking component to crash or otherwise become unavailable. Microsoft indicates the issue is constrained to the same network segment, such as the same switch or virtual network, rather than being exploitable across routed networks or a WAN. The vulnerability has a changed scope in some deployment scenarios, including Hyper-V environments where a low-privilege guest may be able to cross the guest boundary and induce denial of service on the host environment.
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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.
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.
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.