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CVE-2026-54999 is a high-severity remote code execution vulnerability in the Windows TCP/IP stack caused by improper synchronization during concurrent execution, resulting in a race condition. The flaw is classified as CWE-362. An unauthorized attacker can exploit the condition over an adjacent network without requiring privileges or user interaction. Microsoft rates the issue with CVSS v3.1 8.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating low attack complexity and high impact across confidentiality, integrity, and availability. Affected platforms include multiple supported Windows 10, Windows 11, and Windows Server releases, including certain Server Core installations.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Windows TCP/IP.
A high-severity remote code execution vulnerability in Windows TCP/IP caused by a race condition, allowing an unauthorized attacker to execute code over an adjacent network.
A critical remote code execution vulnerability in Windows TCP/IP.
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.