Ubuntu dotnet Important Request Smuggling Information Disclosure 8641

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Several security issues were fixed in .NET. Software Description: - dotnet10: .NET CLI tools and runtime - dotnet8: .NET CLI tools and runtime Details: Miha Zupan discovered that .NET did not properly interpret certain HTTP requests. An attacker could possibly use this issue to perform request smuggling and bypass a security feature. (CVE-2026-62899) Ivan Demchuk discovered that .NET did not properly handle the removal of sensitive information before storage or transfer. An attacker could possibly use this issue to disclose sensitive information. (CVE-2026-62900) Kevin Gosse discovered that .NET did not properly check an input for a loop condition. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-62901) Kevin Gosse discovered that .NET did not properly perform error checking when securing shared resources used for diagnostics IPC. An attacker could possibly use this issue to elevate privileges. (CVE-2026-62909)

Several security issues were fixed in .NET.

Software Description:

- dotnet10: .NET CLI tools and runtime

- dotnet8: .NET CLI tools and runtime

Miha Zupan discovered that .NET did not properly interpret certain HTTP

requests. An attacker could possibly use this issue to perform request

smuggling and bypass a security feature. (CVE-2026-62899)

Ivan Demchuk discovered that .NET did not properly handle the removal of

sensitive information before storage or transfer. An attacker could possibly

use this issue to disclose sensitive information. (CVE-2026-62900)

Kevin Gosse discovered that .NET did not properly check an input for a loop

condition. An attacker could possibly use this issue to cause a denial of

service. (CVE-2026-62901)

Kevin Gosse discovered that .NET did not properly perform error checking

when securing shared resources used for diagnostics IPC. An attacker could

possibly use this issue to elevate privileges. (CVE-2026-62909)

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS aspnetcore-runtime-10.0 10.0.11-0ubuntu1~26.04.1 dotnet-host-10.0 10.0.11-0ubuntu1~26.04.1 dotnet-hostfxr-10.0 10.0.11-0ubuntu1~26.04.1 dotnet-runtime-10.0 10.0.11-0ubuntu1~26.04.1 dotnet-sdk-10.0 10.0.111-0ubuntu1~26.04.1 dotnet-sdk-aot-10.0 10.0.111-0ubuntu1~26.04.1 dotnet10 10.0.111-10.0.11-0ubuntu1~26.04.1 Ubuntu 24.04 LTS aspnetcore-runtime-10.0 10.0.11-0ubuntu1~24.04.1 aspnetcore-runtime-8.0 8.0.30-0ubuntu1~24.04.1 dotnet-host-10.0 10.0.11-0ubuntu1~24.04.1 dotnet-host-8.0 8.0.30-0ubuntu1~24.04.1 dotnet-hostfxr-10.0 10.0.11-0ubuntu1~24.04.1 dotnet-hostfxr-8.0 8.0.30-0ubuntu1~24.04.1 dotnet-runtime-10.0 10.0.11-0ubuntu1~24.04.1 dotnet-runtime-8.0 8.0.30-0ubuntu1~24.04.1 dotnet-sdk-10.0 10.0.111-0ubuntu1~24.04.1 dotnet-sdk-8.0 8.0.130-0ubuntu1~24.04.1 dotnet-sdk-aot-10.0 10.0.111-0ubuntu1~24.04.1 dotnet10 10.0.111-10.0.11-0ubuntu1~24.04.1 dotnet8 8.0.130-8.0.30-0ubuntu1~24.04.1 Ubuntu 22.04 LTS aspnetcore-runtime-8.0 8.0.30-0ubuntu1~22.04.1 dotnet-host-8.0 8.0.30-0ubuntu1~22.04.1 dotnet-hostfxr-8.0 8.0.30-0ubuntu1~22.04.1 dotnet-runtime-8.0 8.0.30-0ubuntu1~22.04.1 dotnet-sdk-8.0 8.0.130-0ubuntu1~22.04.1 dotnet8 8.0.130-8.0.30-0ubuntu1~22.04.1 In general, a standard system update will make all the necessary changes.

CVE-2026-62899, CVE-2026-62900, CVE-2026-62901, CVE-2026-62909

Ubuntu Security Notice USN-8641-1

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