GitHub Security Advisory: GHSA-4vgm-c2wm-63mw
Package: Microsoft.AspNetCore.App.Runtime.win-x86 (NUGET)
Severity: HIGH (CVSS 7.5)
CWE: CWE-770: Allocation of Resources Without Limits or Throttling
Vulnerable versions: >= 10.0.0, <= 10.0.3
Patched in: 10.0.4

Summary: .NET Denial of Service Vulnerability

Details:
# Microsoft Security Advisory CVE-2026-26130 – .NET Denial of Service Vulnerability

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0, .NET 9.0, and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A denial of service vulnerability exists in ASP.NET Core due to uncontrolled resource consumption. A specially crafted message to a SignalR server can exhaust an internal buffer and cause a Denial of Service.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/385

## CVSS Details

- **Version:** 3.1
- **Score:** 7.5
- **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`
- **Severity:** High
- **Weakness:** CWE-770 (Uncontrolled Resource Consumption)

## Affected Platforms

- **Platforms:** All
- **Architectures:** All

## Affected Products

### <a name=".NET 8"></a>.NET 8
Package name | Affected version | Patched version
------------ | ---------------- | -------------------------
[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | >= 8.0.0, <= 8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | >= 8.0.0, <= 8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | >= 8.0.0, <= 8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | >= 8.0.0, <= 8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | >= 8.0.0, <= 8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | >= 8.0.0, < =8.0.24 | 8.0.25
[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuge