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

• NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 8.0.0, < 8.0.32 → fixed in 8.0.32

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 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 | >= 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, How do I know if I am affected? If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue? 1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs. 2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command. Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other Information Reporting Security Issues If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an…