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CVE-2026-62899— .NET Security Feature Bypass Vulnerability

Quick assessment

Affected
Microsoft .NET 10.0
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft .NET是美国Microsoft公司的一个致力于敏捷软件开发、快速应用开发、平台无关性和网络透明化的软件框架。 Microsoft .NET存在输入验证错误漏洞，该漏洞源于HTTP请求/响应不一致解释（HTTP请求/响应走私），可能导致未经授权的攻击者通过网络绕过安全功能。

CVSS 5.9 · Medium EPSS 0.75% · P54

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft .NET 10.0 10.0.0< 10.0.11 affected
Microsoft .NET 8.0 8.0.0< 8.0.30 affected
Microsoft .NET 9.0 9.0.0< 9.0.19 affected
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0< 17.14.38 affected
Microsoft Microsoft Visual Studio 2026 version 18.8 18.0< 18.8.3 affected
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I. Basic Information for CVE-2026-62899

Vulnerability Information
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Vulnerability Title
.NET Security Feature Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft .NET 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft .NET是美国Microsoft公司的一个致力于敏捷软件开发、快速应用开发、平台无关性和网络透明化的软件框架。 Microsoft .NET存在输入验证错误漏洞，该漏洞源于HTTP请求/响应不一致解释（HTTP请求/响应走私），可能导致未经授权的攻击者通过网络绕过安全功能。
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 .NET 10.0 10.0.0 ~ 10.0.11 -
Microsoft .NET 8.0 8.0.0 ~ 8.0.30 -
Microsoft .NET 9.0 9.0.0 ~ 9.0.19 -
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 ~ 17.14.38 -
Microsoft Microsoft Visual Studio 2026 version 18.8 18.0 ~ 18.8.3 -

II. Public POCs for CVE-2026-62899

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III. Intelligence Information for CVE-2026-62899

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Vendor Advisories for CVE-2026-62899 (1)

Same Patch Batch · Microsoft · 2026-08-11 · 402 CVEs total

CVE-2026-62878 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-59124 9.8 CRITICAL Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability
CVE-2026-65791 9.8 CRITICAL Windows iSCSI Target Service Remote Code Execution Vulnerability
CVE-2026-62815 9.8 CRITICAL Microsoft QUIC Remote Code Execution Vulnerability
CVE-2026-62893 9.8 CRITICAL Windows Deployment Services TFTP Server Remote Code Execution Vulnerability
CVE-2026-50516 9.4 CRITICAL Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability
CVE-2026-70306 9.3 CRITICAL Microsoft Office SharePoint Spoofing Vulnerability
CVE-2026-70337 8.8 HIGH Microsoft PowerShell Remote Code Execution Vulnerability
CVE-2026-65660 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-65767 8.8 HIGH Microsoft Teams for Android Spoofing Vulnerability
CVE-2026-65663 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-65658 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-70336 8.8 HIGH Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-70329 8.8 HIGH Microsoft Outlook Remote Code Execution Vulnerability
CVE-2026-62872 8.8 HIGH .NET Framework Elevation of Privilege Vulnerability
CVE-2026-70321 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-62913 8.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2026-62823 8.8 HIGH Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69320 8.8 HIGH Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-62822 8.8 HIGH Windows GDI+ Remote Code Execution Vulnerability

Showing top 20 of 402 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: .NET 10.0
Same vendor: Microsoft
Same weakness: CWE-444

V. Comments for CVE-2026-62899

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