Microsoft Security Response CenterCVE-2026-56170

ASP.NET Core Denial of Service Vulnerability

HighVendor CVSS 7.5 / 10 1 CVE Published Jul 14, 2026 at 7:00 AM UTC

Summary

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Install KB5104034. Install KB5104032. Install KB5104033.

Update history

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Oct 28, 2026 at 10:00 PM UTC
- Added affected products: .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS.
- Removed affected products: .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS.

Jul 14, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 28, 2026 at 11:20 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Nov 11, 2026 at 2:20 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

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