CRITICAL 9.8 Microsoft

CVE-2026-47291

HTTP.sys Remote Code Execution Vulnerability

Microsoft Security Update 2026-Jun: HTTP.sys Remote Code Execution Vulnerability

Affected Products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems

References

Published: 2026-06-09 · Source: Microsoft · Feed updated: 2026-09-18

This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-06-09 via Microsoft. EPSS score: 22.8% (top 2% of all CVEs by exploitation probability). Affected: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 5 more.

Risk Timeline

CVE Disclosed2026-06-09 · 100 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47291

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-47291

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-57092	Microsoft Windows VMSwitch Elevation of Privilege Vulnerability	CRITICAL	9.9
CVE-2025-50165 PoC	Windows Graphics Component Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2025-53766	GDI+ Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-62815	Microsoft QUIC Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-62878	Windows DNS Server Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-62893	Windows Deployment Services TFTP Server Remote Code Execution Vulnerability	CRITICAL	9.8

vulnfeed aggregates 14649 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.