CVE-2026-42899— ASP.NET Core Denial of Service 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 ASP.NET Core是美国微软（Microsoft）公司的一框跨平台开源框架。该框架用于构建Web应用、物联网应用和移动后端等基于云的应用程序。 Microsoft ASP.NET Core存在安全漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：.NET 8.0 installed on Linux,.NET 9.0 installed on Windows,.NET 9.0 installed on Mac OS,.NET 10.0 installed on Ma
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-42899
Vulnerability Information
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Vulnerability Title
ASP.NET Core Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Loop with unreachable exit condition ('infinite loop') in ASP.NET Core 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
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft ASP.NET Core 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft ASP.NET Core是美国微软（Microsoft）公司的一框跨平台开源框架。该框架用于构建Web应用、物联网应用和移动后端等基于云的应用程序。 Microsoft ASP.NET Core存在安全漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：.NET 8.0 installed on Linux,.NET 9.0 installed on Windows,.NET 9.0 installed on Mac OS,.NET 10.0 installed on Ma
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
II. Public POCs for CVE-2026-42899
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-42899 (1)
Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total
| CVE-2026-42898 | 9.9 CRITICAL | Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability |
| CVE-2026-42823 | 9.9 CRITICAL | Azure Logic Apps Elevation of Privilege Vulnerability |
| CVE-2026-41089 | 9.8 CRITICAL | Windows Netlogon Remote Code Execution Vulnerability |
| CVE-2026-41096 | 9.8 CRITICAL | Windows DNS Client Remote Code Execution Vulnerability |
| CVE-2026-40379 | 9.3 CRITICAL | Azure Entra ID Spoofing Vulnerability |
| CVE-2026-40402 | 9.3 CRITICAL | Windows Hyper-V Elevation of Privilege Vulnerability |
| CVE-2026-42833 | 9.1 CRITICAL | Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability |
| CVE-2026-33117 | 9.1 CRITICAL | Azure SDK for Java Security Feature Bypass Vulnerability |
| CVE-2026-41103 | 9.1 CRITICAL | Microsoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability |
| CVE-2026-41613 | 8.8 HIGH | Visual Studio Code Elevation of Privilege Vulnerability |
| CVE-2026-40357 | 8.8 HIGH | Microsoft SharePoint Server Remote Code Execution Vulnerability |
| CVE-2026-35436 | 8.8 HIGH | Microsoft Office Click-To-Run Elevation of Privilege Vulnerability |
| CVE-2026-41109 | 8.8 HIGH | GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability |
| CVE-2026-41094 | 8.8 HIGH | Microsoft Data Formulator Remote Code Execution Vulnerability |
| CVE-2026-40420 | 8.8 HIGH | Microsoft Office Click-To-Run Elevation of Privilege Vulnerability |
| CVE-2026-40403 | 8.8 HIGH | Windows Graphics Component Remote Code Execution Vulnerability |
| CVE-2026-40370 | 8.8 HIGH | SQL Server Remote Code Execution Vulnerability |
| CVE-2026-41086 | 8.8 HIGH | Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability |
| CVE-2026-35439 | 8.8 HIGH | Microsoft SharePoint Server Remote Code Execution Vulnerability |
| CVE-2026-33112 | 8.8 HIGH | Microsoft SharePoint Server Remote Code Execution Vulnerability |
Showing top 20 of 125 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: .NET 10.0
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CVE-2026-69806
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CVE-2026-71328
.NET and Visual Studio Remote Code Execution Vulnerability -
CVE-2026-69304
ASP.NET Core Denial of Service Vulnerability -
CVE-2026-58649
.NET Information Disclosure Vulnerability -
CVE-2026-69439
.NET and Visual Studio Elevation of Privilege Vulnerability
Same vendor: Microsoft
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CVE-2026-105798
SimpleChat: Stored XSS via group document filename in inline -
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Kiota: Code injection through doc-comment delimiter reformat -
CVE-2026-105795
Kiota: Unsafe oauth_card_path references in Kiota-generated -
CVE-2026-105794
MsQuic: Improper Certificate Validation in Microsoft.Native.
Same weakness: CWE-835
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CVE-2026-107696
FFmpeg through 9.0.2 Infinite Loop via RTSP Redirect Handlin -
CVE-2026-107695
FFmpeg before 8.1.3 HLS Demuxer Infinite Loop via Self-Refer -
CVE-2026-107677
FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty Se -
CVE-2026-107577
Loop with Unreachable Exit Condition ('Infinite Loop') in hM -
CVE-2026-106164
Infinite Loop in Telerik Document Processing XLS Import
V. Comments for CVE-2026-42899
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