GHSA-4VGM-C2WM-63MW
Vulnerability from github – Published: 2026-03-11 21:11 – Updated: 2026-03-11 21:11
VLAI?
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
.NET 8
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.AspNetCore.App.Runtime.linux-arm | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 8.0.0, <= 8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, <= 8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 8.0.0, <= 8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.win-arm | >= 8.0.0, <= 8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | >= 8.0.0, < =8.0.24 | 8.0.25 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.24 | 8.0.25 |
.NET 9
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.AspNetCore.App.Runtime.linux-arm | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.win-arm | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 9.0.0, < =9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.13 | 9.0.14 |
.NET 10
| Package name | Affected version | Patched version |
|---|---|---|
| Microsoft.AspNetCore.App.Runtime.linux-arm | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.win-arm | >= 10.0.0, < =10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
| Microsoft.AspNetCore.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.3 | 10.0.4 |
Advisory FAQ
How do I know if I am affected?
If using an affected package listed in affected products or affected packages, you're exposed to the vulnerability.
How do I fix the issue?
- To fix the issue please install the latest version of .NET 8.0, NET 9.0, or .NET 10.0, as appropriate. 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.
- 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 --infocommand.
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.
Security 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.
Support
You can ask questions about this issue on GitHub in 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. You can ask questions in the linked discussion issue.
Disclaimer
The 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.
External Links
Acknowledgements
Bartłomiej Dach
Revisions
V1.0 (March 10, 2026): Advisory published.
Severity ?
7.5 (High)
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"severity": "HIGH"
},
"details": "# Microsoft Security Advisory CVE-2026-26130 \u2013 .NET Denial of Service Vulnerability\n\n## 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\nA 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.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/385\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Score:** 7.5\n- **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`\n- **Severity:** High\n- **Weakness:** CWE-770 (Uncontrolled Resource Consumption)\n\n## Affected Platforms\n\n- **Platforms:** All\n- **Architectures:** All\n\n## Affected Products\n\n### \u003ca name=\".NET 8\"\u003e\u003c/a\u003e.NET 8\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64) | \u003e= 8.0.0, \u003c =8.0.24 | 8.0.25\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86) | \u003e= 8.0.0, \u003c= 8.0.24 | 8.0.25\n\n\n### \u003ca name=\".NET 9\"\u003e\u003c/a\u003e.NET 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm) | \u003e= 9.0.0, \u003c= 9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | \u003e= 9.0.0, \u003c= 9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm) | \u003e= 9.0.0, \u003c= 9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64) | \u003e= 9.0.0, \u003c =9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64) | \u003e= 9.0.0, \u003c= 9.0.13 | 9.0.14\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86) | \u003e= 9.0.0, \u003c= 9.0.13 | 9.0.14\n\n### \u003ca name=\".NET 10\"\u003e\u003c/a\u003e.NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | \u003e= 10.0.0, \u003c= 10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm) | \u003e= 10.0.0, \u003c =10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64) | \u003e= 10.0.0, \u003c= 10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64) | \u003e= 10.0.0, \u003c= 10.0.3 | 10.0.4\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86) | \u003e= 10.0.0, \u003c= 10.0.3 | 10.0.4\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf using an affected package listed in [affected products](#affected-products) or [affected packages](#affected-packages), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow 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 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.\n2. 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. \n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve 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 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](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\nYou can ask questions about this issue on GitHub in 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. You can ask questions in 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-2026-26130]( https://www.cve.org/CVERecord?id=CVE-2026-26130)\n\n### Acknowledgements\n\nBart\u0142omiej Dach\n\n### Revisions\n\nV1.0 (March 10, 2026): Advisory published.",
"id": "GHSA-4vgm-c2wm-63mw",
"modified": "2026-03-11T21:11:26Z",
"published": "2026-03-11T21:11:26Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-4vgm-c2wm-63mw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26130"
},
{
"type": "PACKAGE",
"url": "https://github.com/dotnet/aspnetcore"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26130"
},
{
"type": "WEB",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-26130"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": ".NET Denial of Service Vulnerability"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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