fkie_cve-2026-70181

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

GHSA-w5qq-qrpp-rf4c — Microsoft Security Advisory CVE-2026-70181 - ASP.NET Core Denial of Service Vulnerability

Affected: NuGet: Microsoft.AspNetCore.App.Runtime.linux-arm, NuGet: Microsoft.AspNetCore.App.Runtime.linux-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-arm, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-x64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-x64, NuGet: Microsoft.AspNetCore.App.Runtime.osx-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.osx-x64, NuGet: Microsoft.AspNetCore.App.Runtime.win-arm, NuGet: Microsoft.AspNetCore.App.Runtime.win-arm64 and 2 more

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.WebUtilities. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

FileBufferingReadStream eagerly rents buffers during multipart processing, allowing memory exhaustion and denial of service.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/459

## CVSS Details

- **Version:** 3.1 - **Severity:** High - **Score:** 7.5 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

- **Weakness:** CWE-770 (Allocation of Resources Without Limits or Throttling) ## Affected Platforms

- **Platforms:** Windows, Linux, macOS - **Architectures:** All

## <a name="affected-packages"></a>Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name | Affected version | Patched version ------------ | ---------------- | --------------- [Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | >= 9.0.0, <= 9.0.20 | 9.0.21 [Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | >= 9.0.0, <= 9.0.20 | 9.0.21 [Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-m…

NCSC-2026-0426 — Kwetsbaarheden verholpen in Microsoft Developer Tools

NCSC-2026-0426

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fkie_cve-2026-70181

GHSA-w5qq-qrpp-rf4c — Microsoft Security Advisory CVE-2026-70181 - ASP.NET Core Denial of Service Vulnerability

NCSC-2026-0426 — Kwetsbaarheden verholpen in Microsoft Developer Tools