{"id":"CVE-2026-50524","kind":"vulnerability","aliases":["CVE-2026-50524","GHSA-w7cw-xp7h-6j5j"],"related":[],"title":"Microsoft Security Advisory CVE-2026-50524 – .NET Denial of Service Vulnerability","description":"## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in .NET TLS/SSL (System.Net.Security). 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 .NET 8, .NET 9, and .NET 10 when processing TLS handshakes. An attacker can send a malformed request and cause application to crash or become unresponsive.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/413\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** High\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- **Weakness:** CWE-1287 (Improper Validation of Specified Type of Input)\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 10.0\"></a>.NET 10.0\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-arm64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-x64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x64)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n[Microsoft.NetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x86)               | >= 10.0.0, <= 10.0.9 | 10.0.10\n\n### <a name=\".NET 9.0\"></a>.NET 9.0\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-arm64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-x64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x64)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n[Microsoft.NetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x86)               | >= 9.0.0, <= 9.0.17 | 9.0.18\n\n### <a name=\".NET 8.0\"></a>.NET 8.0\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-arm64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-x64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x64)               | >= 8.0.0, <= 8.0.28 | 8.0.29\n[Microsoft.NetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x86)               | >= 8.0.0, <= 8.0.28 | 8.0.29\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), you're 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. 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 nuget 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've 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-2026-50524]( https://www.cve.org/CVERecord?id=CVE-2026-50524)\n\n### Acknowledgements\n\n41ae55e9310ff27fa6f26af4727e5590\n\n### Revisions\n\nV1.0 (July 14, 2026): Advisory published.","summary":"A flaw in .NET's TLS/SSL code (System.Net.Security) lets a remote attacker send a malformed handshake that crashes or freezes the application. The sources describe denial of service only, with no code execution or data theft.","severity":"high","cvss":7.5,"epss":0.01232,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft.NetCore.App.Runtime.linux-arm","fixed":["10.0.10"],"affected":">= 10.0.0, <= 10.0.9","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-arm64","fixed":["10.0.10"],"affected":">= 10.0.0, <= 10.0.9","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-arm","fixed":["10.0.10"],"affected":">= 10.0.0, <= 10.0.9","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-arm64","fixed":["10.0.10"],"affected":">= 10.0.0, <= 10.0.9","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-x64","fixed":["10.0.10"],"affected":">= 10.0.0, <= 10.0.9","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-x64","fixed":["10.0.10"],"affected":">= 10.0.0, <= 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9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-arm","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-arm64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-musl-x64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.linux-x64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.osx-arm64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.osx-x64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.win-arm","fixed":["9.0.18"],"affected":">= 9.0.0, <= 9.0.17","ecosystem":"nuget"},{"name":"Microsoft.NetCore.App.Runtime.win-arm64","fixed":["9.0.18"],"affected":">= 9.0.0, <= 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separately.","fix":"- .NET 10: move to `10.0.10` or later.\n- .NET 9: move to `9.0.18` or later.\n- .NET 8: move to `8.0.29` or later.\n- Update the `Microsoft.NetCore.App.Runtime` package references, and recompile and redeploy self-contained applications.","status":"open","published_at":"2026-07-14T20:17:37+00:00","first_seen_at":"2026-11-04T04:12:14+00:00","triaged_at":"2026-11-04T04:14:22+00:00","updated_at":"2026-11-04T04:16:16+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-04T04:14:22Z","model":"claude-haiku-5-5","output":{"fix":"- .NET 10: move to `10.0.10` or later.\n- .NET 9: move to `9.0.18` or later.\n- .NET 8: move to `8.0.29` or later.\n- Update the `Microsoft.NetCore.App.Runtime` package references, and recompile and redeploy self-contained applications.","reach":"internet","title":".NET: malformed TLS handshake can crash or hang applications","impact":"low","summary":"A flaw in .NET's TLS/SSL code (System.Net.Security) lets a remote attacker send a malformed handshake that crashes or freezes the application. The sources describe denial of service only, with no code execution or data theft.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["dotnet","csharp","self-hosted","windows","linux","macos"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"remote crash or hang of the application via malformed TLS handshake","analyst_note":"","how_to_check":"- Run `dotnet --info` to list the installed .NET runtime versions and check whether any 8.x, 9.x or 10.x runtime is at or below the affected range.\n- Search project files and lock files for `Microsoft.NetCore.App.Runtime` and self-contained publish settings, and check the version of each reference.\n- Self-contained applications carry their own runtime, so they must be checked separately.","plain_action":"","needs_analyst":false,"not_affected_if":["unaffected-runtime-version"],"who_is_affected":"Any application running on .NET 8, 9 or 10 with a runtime at or below the affected versions is exposed to a TLS handshake that crashes or hangs it. Self-contained applications bundle their own runtime, so they stay vulnerable until they are rebuilt against a patched version. Applications on unaffected runtimes can skip this.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.001304,"input_tokens":9658,"output_tokens":676,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-1287':133B,284C '-2026':5A,13A,21A '-50524':6A,14A,22A '/av':270C '/dotnet/announcements/issues/413':258C '/packages/microsoft.netcore.app.runtime.linux-arm)':329C,439C '/packages/microsoft.netcore.app.runtime.linux-arm64)':337C,447C '/packages/microsoft.netcore.app.runtime.linux-musl-arm)':347C,457C '/packages/microsoft.netcore.app.runtime.linux-musl-arm64)':357C,467C '/packages/microsoft.netcore.app.runtime.linux-musl-x64)':367C '/packages/microsoft.netcore.app.runtime.linux-x64)':375C '/packages/microsoft.netcore.app.runtime.osx-arm64)':383C '/packages/microsoft.netcore.app.runtime.osx-x64)':391C '/packages/microsoft.netcore.app.runtime.win-arm)':399C '/packages/microsoft.netcore.app.runtime.win-arm64)':407C 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An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}