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CVE-2026-47291

CriticalPublished

HTTP.sys Remote Code Execution Vulnerability

Published: Jun 9, 2026
Updated: Aug 25, 2026
Assigning CNA: microsoft
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

22.8%

Moderate · next 30 days

Percentile: 97.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.

Sources

CVE-2026-49160-CVE-2026-47291-HTTP.sysPoC
HTTP.sys Denial of Service Vulnerability & HTTP.sys Remote Code Execution Vulnerability

Responsible use

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