Vulnerability Intelligence Report
HTTP.sys Remote Code Execution Vulnerability
CVE-2026-47291
Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:0.97%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 < 10.0.14393.9234 (affected) |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 < 10.0.17763.8880 (affected) |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 < 10.0.19044.7417 (affected) |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 < 10.0.19045.7417 (affected) |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 < 10.0.22631.7219 (affected) |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 < 10.0.22631.7219 (affected) |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 < 10.0.26100.8655 (affected) |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 < 10.0.26200.8655 (affected) |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 < 10.0.28000.2269 (affected) |
| Microsoft | Windows Server 2012 | 6.2.9200.0 < 6.2.9200.26132 (affected) |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 < 6.2.9200.26132 (affected) |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 < 6.3.9600.23228 (affected) |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 < 6.3.9600.23228 (affected) |
| Microsoft | Windows Server 2016 | 10.0.14393.0 < 10.0.14393.9234 (affected) |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 < 10.0.14393.9234 (affected) |
| Microsoft | Windows Server 2019 | 10.0.17763.0 < 10.0.17763.8880 (affected) |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 < 10.0.17763.8880 (affected) |
| Microsoft | Windows Server 2022 | 10.0.20348.0 < 10.0.20348.5256 (affected) |
| Microsoft | Windows Server 2025 | 10.0.26100.0 < 10.0.26100.32995 (affected) |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 < 10.0.26100.32995 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.974%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-05-18T23:53:33 |
| Published | 2026-06-09T17:04:59 |
| Patch Date | 2026-06-09 |
| Last Updated | 2026-09-24T13:43:59 |
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