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Critical Denial of Service Vulnerability in .NET on Ubuntu Systems

Critical Denial of Service Vulnerability in .NET on Ubuntu Systems

First seen 26 May 2026, 15:30 UTC • •
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ThreatCluster AI
ThreatCluster •May 27, 2026 at 15:29 UTC
  • •.NET vulnerability allows denial of service through crafted network traffic.
  • •Affected Ubuntu versions include 26.04 LTS, 25.10, 24.04 LTS, and 22.04 LTS.
  • •Users are urged to update to the latest package versions to mitigate risks.

A critical vulnerability has been identified in .NET affecting multiple versions of Ubuntu, including 26.04 LTS and earlier releases. Discovered by Muhammad Abdul Rehman, the flaw allows specially crafted network traffic to cause excessive resource consumption, potentially leading to a denial of service. The vulnerability arises from improper handling of network requests, resulting in a loop without an exit condition. All users of affected Ubuntu versions are advised to update their systems to mitigate this risk. The issue impacts .NET CLI tools and runtimes across several versions. The recommended updates are available for immediate installation. Ubuntu Pro users benefit from extended security coverage for these packages. The vulnerability underscores the importance of timely system updates to maintain security.

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Updated 142d ago How this analysis works

Timeline

2026-05-25
Vulnerability discovered
Muhammad Abdul Rehman identified a critical flaw in .NET affecting Ubuntu systems, leading to potential denial of service.
Linuxsecurity
2026-05-25
Security notice published
Ubuntu released USN-8298-1 detailing the .NET vulnerability and recommended updates for affected systems.
Ubuntu

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