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Microsoft Security Response CenterCVE-2026-56170

ASP.NET Core Denial of Service Vulnerability

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

Read the vendor bulletin Get alerts for NET 10.0 installed on Mac OS
7.5CVSS out of 10High severity
Scope

What the vendor says is affected

  • .NET 10.0 installed on Mac OS
  • .NET 10.0 installed on Linux
  • .NET 8.0 installed on Windows
  • .NET 8.0 installed on Linux
  • .NET 8.0 installed on Mac OS
  • .NET 9.0 installed on Linux
  • .NET 9.0 installed on Mac OS
  • .NET 9.0 installed on Windows

Versions the vendor lists as fixed

  • 10.0.10
  • 8.0.29
  • 9.0.18
Next step

What the vendor recommends

Install KB5104034. Install KB5104032. Install KB5104033.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-56170View CVSS, KEV, EPSS, and threat context
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