CVE-2026-70159: ASP.NET Core Denial of Service Vulnerability

Overview

Severity
High (CVSS 7.5)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Category
Denial of Service
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Oct
Released
2026-10-13

Description

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Affected Products (26)

Other

  • Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Common on .NET 10.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Core on .NET 10.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Common on .NET 11.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Core on .NET 11.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Common on .NET 8.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Core on .NET 8.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Common on .NET 9.0 installed on Mac OS
  • Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Windows
  • Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Linux
  • Microsoft.AspNetCore.SignalR.Core on .NET 9.0 installed on Mac OS

Developer Tools

  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft Visual Studio 2022 version 17.14

Security Updates (2)

Acknowledgments

<a href="https://vincent55.tw/">Vincent55 Yang</a>, nono

Revision History

  • 2026-10-13: Information published.