1. Ubuntu Security Notices
  2. USN-8740-1

USN-8740-1: .NET vulnerabilities

Publication date

10 September 2026

Overview

Several security issues were fixed in .NET.

Releases

Packages

  • dotnet10 - .NET CLI tools and runtime
  • dotnet8 - .NET CLI tools and runtime

Details

Weeraphat Srisutham discovered that the .NET watch BrowserRefreshServer did
not properly validate cross-origin WebSocket connections. An attacker could
possibly use this issue to expose sensitive information. (CVE-2026-58649)

Rajesh Chada discovered that the .NET watch AspireServerService improperly
exposed information through the use of certain arguments. An attacker could
possibly use this issue to elevate privileges and execute arbitrary code.
(CVE-2026-69806)

Weeraphat Srisutham discovered that the .NET watch BrowserRefreshServer did
not properly validate cross-origin WebSocket connections. An attacker could
possibly use this issue to expose sensitive information. (CVE-2026-58649)

Rajesh Chada discovered that the .NET watch AspireServerService improperly
exposed information through the use of certain arguments. An attacker could
possibly use this issue to elevate privileges and execute arbitrary code.
(CVE-2026-69806)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
26.04 LTS resolute aspnetcore-runtime-10.0 –  10.0.12-0ubuntu1~26.04.1
dotnet-host-10.0 –  10.0.12-0ubuntu1~26.04.1
dotnet-hostfxr-10.0 –  10.0.12-0ubuntu1~26.04.1
dotnet-runtime-10.0 –  10.0.12-0ubuntu1~26.04.1
dotnet-sdk-10.0 –  10.0.112-0ubuntu1~26.04.1
dotnet-sdk-aot-10.0 –  10.0.112-0ubuntu1~26.04.1
dotnet-sdk-dbg-10.0 –  10.0.112-0ubuntu1~26.04.1
dotnet10 –  10.0.112-10.0.12-0ubuntu1~26.04.1
24.04 LTS noble aspnetcore-runtime-10.0 –  10.0.12-0ubuntu1~24.04.1
aspnetcore-runtime-8.0 –  8.0.31-0ubuntu1~24.04.1
dotnet-host-10.0 –  10.0.12-0ubuntu1~24.04.1
dotnet-host-8.0 –  8.0.31-0ubuntu1~24.04.1
dotnet-hostfxr-10.0 –  10.0.12-0ubuntu1~24.04.1
dotnet-hostfxr-8.0 –  8.0.31-0ubuntu1~24.04.1
dotnet-runtime-10.0 –  10.0.12-0ubuntu1~24.04.1
dotnet-runtime-8.0 –  8.0.31-0ubuntu1~24.04.1
dotnet-sdk-10.0 –  10.0.112-0ubuntu1~24.04.1
dotnet-sdk-8.0 –  8.0.131-0ubuntu1~24.04.1
dotnet-sdk-aot-10.0 –  10.0.112-0ubuntu1~24.04.1
dotnet-sdk-dbg-10.0 –  10.0.112-0ubuntu1~24.04.1
dotnet10 –  10.0.112-10.0.12-0ubuntu1~24.04.1
dotnet8 –  8.0.131-8.0.31-0ubuntu1~24.04.1
22.04 LTS jammy aspnetcore-runtime-8.0 –  8.0.31-0ubuntu1~22.04.1
dotnet-host-8.0 –  8.0.31-0ubuntu1~22.04.1
dotnet-hostfxr-8.0 –  8.0.31-0ubuntu1~22.04.1
dotnet-runtime-8.0 –  8.0.31-0ubuntu1~22.04.1
dotnet-sdk-8.0 –  8.0.131-0ubuntu1~22.04.1
dotnet8 –  8.0.131-8.0.31-0ubuntu1~22.04.1

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References

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