CVE-2026-42899: Microsoft.AspNetCore.App.Runtime.win arm Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9v76-4qcc-frgh",
  "modified" : "2026-05-18T19:10:59Z",
  "published" : "2026-05-18T19:10:59Z",
  "aliases" : [ "CVE-2026-42899" ],
  "summary" : "Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability",
  "details" : "## Executive Summary: \n\nMicrosoft 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.\n\nLoop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/397\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** \n- **Score:** 7.5\n- **Vector:** AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C \n- **Weakness:** CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')\n\n## Affected Platforms\n\n- **Platforms:** All\n- **Architectures:** All\n\n## <a name=\"affected-packages\"></a>Affected Packages\nThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below\n\n### <a name=\".NET 10\"></a>.NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | >= 10.0.0, <= 10.0.7 | 10.0.8\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | >= 10.0.0, <= 10.0.7 | 10.0.8\n\n### <a name=\".NET 9\"></a>.NET 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | >= 9.0.0, <= 9.0.15 | 9.0.16\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | >= 9.0.0, <= 9.0.15 | 9.0.16\n\n\n### <a name=\".NET 8\"></a>.NET 8\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | >= 8.0.0, <= 8.0.26 | 8.0.27\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | >= 8.0.0, <= 8.0.26 | 8.0.27\n\n## Advisory FAQ\n\n### <a name=\"how-affected\"></a>How do I know if I am affected?\n\nIf using a package listed in [affected packages](#affected-packages), an application is exposed to the vulnerability.\n\n### <a name=\"how-fix\"></a>How do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET 8.0, NET 9.0, or .NET 10.0, as appropriate. If developers have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt them to update Visual Studio, which will also update the application's .NET  SDKs.\n2. If an application references the vulnerable package, update the package reference to the patched version. Developers can list the versions they have installed by running the `dotnet --info` command. \n\nOnce developers have installed the updated runtime or SDK, they should restart their apps for the update to take effect.\n\nAdditionally, if developers have deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf a potential security issue has been found in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nQuestions about this issue can be submitted to the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Questions can be submitted through the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-42899]( https://www.cve.org/CVERecord?id=CVE-2026-42899)\n\n### Acknowledgements\nhamayanhamayan Muhammad Abdul Rehman \n\n### Revisions\n\nV1.0 (May 12, 2026): Advisory published.",
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  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-9v76-4qcc-frgh"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42899"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dotnet/announcements/issues/397"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dotnet/aspnetcore"
  }, {
    "type" : "WEB",
    "url" : "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899"
  } ],
  "database_specific" : {
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    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T19:10:59Z",
    "nvd_published_at" : "2026-05-12T18:17:26Z"
  }
}