Microsoft ASP.NET Core denial of service via resource consumption

Severity: high · CVSS 7.5 · Published 2026-11-10

ASP.NET Core, the runtime that powers Microsoft web applications, is vulnerable to a denial-of-service attack where an attacker can exhaust server resources over the network, causing the application to become unavailable. No authentication is required to exploit this vulnerability. The attack allows an unauthorized attacker to disrupt online services and make them inaccessible to legitimate users.

Technologies: Microsoft Asp.Net Core, Microsoft.AspNetCore.Server.HttpSys (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?
Microsoft Asp.Net Core 2.3.10; Microsoft.AspNetCore.Server.HttpSys (NuGet) = 2.3.10.
Is there a fix for This vulnerability?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is This vulnerability attacked?
It is attacked over the network, in a software library.
Am I affected?
Check whether you run Microsoft Asp.Net Core or Microsoft.AspNetCore.Server.HttpSys (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

Uncontrolled resource consumption in ASP.NET Core (specifically Microsoft.AspNetCore.Server.HttpSys version 2.3.10) allows an unauthenticated network attacker to trigger a denial of service. The vulnerability stems from improper memory release after allocation (CWE-401), enabling resource exhaustion attacks. An attacker can send network requests that cause the application to consume excessive memory or other resources, rendering the service unavailable.

Affected products

  • Microsoft ASP.NET Core 2.3.10

Timeline

  • 2026-11-10: disclosed

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