CVE-2026-49787— HTTP.sys Denial of Service Vulnerability
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0< 10.0.14393.9339 | affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0< 10.0.17763.9020 | affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0< 10.0.19044.7548 | affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0< 10.0.19045.7548 | affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0< 10.0.26100.8875 | affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0< 10.0.26200.8875 | affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0< 10.0.28000.2525 | affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0< 10.0.14393.9339 | affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0< 10.0.14393.9339 | affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0< 10.0.17763.9020 | affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0< 10.0.17763.9020 | affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0< 10.0.20348.5386 | affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0< 10.0.26100.33158 | affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0< 10.0.26100.33158 | affected |
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I. Basic Information for CVE-2026-49787
Vulnerability Information
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Vulnerability Title
HTTP.sys Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Allocation of resources without limits or throttling in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows HTTP.sys 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft HTTP.sys是美国Microsoft公司的一个HTTP协议栈组件，主要用于处理HTTP请求，其他功能还包括请求解析、缓存管理和内核级数据转发。 Microsoft Windows HTTP.sys存在资源管理错误漏洞，该漏洞源于资源分配无限制或节流，可能导致未经授权的攻击者通过网络拒绝服务。以下版本受到影响：Windows 10 Version 1607 10.0.14393.9339之前版本、Windows 10 Version 1809 10.0.17763.9020之前版本、
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 ~ 10.0.14393.9339 | - | |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 ~ 10.0.17763.9020 | - | |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 ~ 10.0.19044.7548 | - | |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 ~ 10.0.19045.7548 | - | |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 ~ 10.0.26100.8875 | - | |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 ~ 10.0.26200.8875 | - | |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 ~ 10.0.28000.2525 | - | |
| Microsoft | Windows Server 2016 | 10.0.14393.0 ~ 10.0.14393.9339 | - | |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 ~ 10.0.14393.9339 | - | |
| Microsoft | Windows Server 2019 | 10.0.17763.0 ~ 10.0.17763.9020 | - | |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 ~ 10.0.17763.9020 | - | |
| Microsoft | Windows Server 2022 | 10.0.20348.0 ~ 10.0.20348.5386 | - | |
| Microsoft | Windows Server 2025 | 10.0.26100.0 ~ 10.0.26100.33158 | - | |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 ~ 10.0.26100.33158 | - |
II. Public POCs for CVE-2026-49787
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-49787 (1)
Same Patch Batch · Microsoft · 2026-07-14 · 570 CVEs total
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