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CVE-2026-69304— ASP.NET Core Denial of Service Vulnerability

Quick assessment

Affected
Microsoft .NET 10.0 runtime
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Microsoft公司开源的一款跨平台的Web开发框架。 Microsoft ASP.NET Core存在资源管理错误漏洞，该漏洞源于对高度压缩数据的处理不当（数据放大），可能导致未经授权的攻击者通过网络实施拒绝服务攻击。

CVSS 5.9 · Medium EPSS 0.85% · P59

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
Microsoft .NET 10.0 runtime 10.0.0< 10.0.12 affected
Microsoft .NET 8.0 runtime 8.0.0< 8.0.31 affected
Microsoft .NET 9.0 runtime 9.0.0< 9.0.20 affected
Microsoft ASP.NET Core 10.0 10.0< 10.0.12 affected
Microsoft ASP.NET Core 11.0 11.0< 11.0 RC1 affected
Microsoft ASP.NET Core 8.0 8.0< 8.0.31 affected
Microsoft ASP.NET Core 9.0 9.0< 9.0.20 affected
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0< 17.14.40 affected
Microsoft Microsoft Visual Studio 2026 version 18.9 18.9.0< 18.9.3 affected
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I. Basic Information for CVE-2026-69304

Vulnerability Information
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Vulnerability Title
ASP.NET Core Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper handling of highly compressed data (data amplification) 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:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft ASP.NET Core 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft ASP.NET Core是美国Microsoft公司开源的一款跨平台的Web开发框架。 Microsoft ASP.NET Core存在资源管理错误漏洞，该漏洞源于对高度压缩数据的处理不当（数据放大），可能导致未经授权的攻击者通过网络实施拒绝服务攻击。
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 runtime 10.0.0 ~ 10.0.12 -
Microsoft .NET 8.0 runtime 8.0.0 ~ 8.0.31 -
Microsoft .NET 9.0 runtime 9.0.0 ~ 9.0.20 -
Microsoft ASP.NET Core 10.0 10.0 ~ 10.0.12 -
Microsoft ASP.NET Core 11.0 11.0 ~ 11.0 RC1 -
Microsoft ASP.NET Core 8.0 8.0 ~ 8.0.31 -
Microsoft ASP.NET Core 9.0 9.0 ~ 9.0.20 -
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 ~ 17.14.40 -
Microsoft Microsoft Visual Studio 2026 version 18.9 18.9.0 ~ 18.9.3 -

II. Public POCs for CVE-2026-69304

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III. Intelligence Information for CVE-2026-69304

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Vendor Advisories for CVE-2026-69304 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941 9.9 CRITICAL Entra ID Elevation of Privilege Vulnerability
CVE-2026-67631 9.8 CRITICAL Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-69769 9.8 CRITICAL Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-69829 9.8 CRITICAL Windows Shell Remote Code Execution Vulnerability
CVE-2026-69493 9.8 CRITICAL Windows Event Logging Service Remote Code Execution Vulnerability
CVE-2026-69276 9.8 CRITICAL Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability
CVE-2026-69910 9.8 CRITICAL Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-69845 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69408 9.8 CRITICAL Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2026-68839 9.8 CRITICAL Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability
CVE-2026-69586 9.8 CRITICAL Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-69431 9.8 CRITICAL Telnet Client Remote Code Execution Vulnerability
CVE-2026-69824 9.8 CRITICAL Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-69491 9.8 CRITICAL Microsoft DirectMusic Remote Code Execution Vulnerability
CVE-2026-69590 9.8 CRITICAL Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-69463 9.8 CRITICAL Windows NTFS Remote Code Execution Vulnerability
CVE-2026-69496 9.8 CRITICAL Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69525 9.8 CRITICAL Remote Desktop Services Remote Code Execution Vulnerability
CVE-2026-70296 9.8 CRITICAL Windows Imaging Component Remote Code Execution Vulnerability
CVE-2026-77493 9.8 CRITICAL Windows Graphics Component Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: .NET 10.0 runtime
Same vendor: Microsoft
Same weakness: CWE-409