Windows TCP/IP Remote Code Execution Vulnerability
CVE-2026-40415 is a remote code execution vulnerability in the Windows TCP/IP component caused by a use-after-free condition. According to the provided content, an unauthorized attacker can trigger the flaw by sending specially crafted malicious network traffic to a vulnerable Windows server. Microsoft assessed the issue as affecting the Windows TCP/IP stack, with no authentication or user interaction required. The vulnerability is remotely reachable over the network and is theoretically wormable, but exploitation is considered difficult because reliable triggering requires the target system to be in sustained low-memory or memory-pressure conditions.
Are you exposed to this one?
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free remote code execution vulnerability in the Windows TCP/IP stack that is technically wormable and requires no authentication or user interaction, though exploitation is constrained by rare memory pressure conditions.
A remote code execution vulnerability in Windows TCP/IP caused by a use-after-free condition. It allows an unauthorized attacker to execute code over a network by sending specially crafted malicious traffic to a vulnerable server, but exploitation is considered difficult due to high attack complexity and required sustained low-memory conditions.
The version that knows your environment.
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.