USN-8641-1: .NET vulnerabilities

Publication date

18 August 2026

Overview

Several security issues were fixed in .NET.


Packages

  • 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. (

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

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:


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