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[USN-8641-1] .NET vulnerabilities

Posted on 19 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8641-1
August 18, 2026

dotnet8, dotnet10 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

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)

Update instructions:

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.

References:
https://ubuntu.com/security/notices/USN-8641-1
CVE-2026-62899, CVE-2026-62900, CVE-2026-62901, CVE-2026-62909

Package Information:
https://launchpad.net/ubuntu/+source/dotnet10/10.0.111-10.0.11-0ubuntu1~26.04.1
https://launchpad.net/ubuntu/+source/dotnet10/10.0.111-10.0.11-0ubuntu1~24.04.1
https://launchpad.net/ubuntu/+source/dotnet8/8.0.130-8.0.30-0ubuntu1~24.04.1
https://launchpad.net/ubuntu/+source/dotnet8/8.0.130-8.0.30-0ubuntu1~22.04.1

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