CVE-2018-8226: Microsoft Windows 10

High severity, CVSS 7.5. EPSS: 13.9% chance of exploitation in the next 30 days.

A denial of service vulnerability exists in the HTTP 2.0 protocol stack (HTTP.sys) when HTTP.sys improperly parses specially crafted HTTP 2.0 requests, aka "HTTP.sys Denial of Service Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers.

Affected products

• Microsoft Windows 10: affected versions not specified; version 1607 only; version 1703 only; version 1709 only; version 1803 only
• Microsoft Windows Server 1803: affected versions not specified
• Microsoft Windows Server 2016: affected versions not specified; version 1709 only

Published 2018-06-14. Last modified 2026-06-17.