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Microsoft Security Response CenterCVE-2026-26171

.NET Denial of Service Vulnerability

Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

Read the vendor bulletin Get alerts for PowerShell
7.5CVSS out of 10High severity
Scope

What the vendor says is affected

  • PowerShell 7.5
  • .NET 10.0 installed on Linux
  • .NET 8.0 installed on Windows
  • .NET 10.0 installed on Mac OS
  • .NET 8.0 installed on Linux
  • .NET 8.0 installed on Mac OS
  • .NET 9.0 installed on Linux
  • .NET 9.0 installed on Windows
  • .NET 9.0 installed on Mac OS
  • PowerShell 7.6

Versions the vendor lists as fixed

  • 7.5.6
  • 10.0.6
  • 8.0.26
  • 9.0.15
  • 7.6.1
Next step

What the vendor recommends

Release Notes Install KB5086095. Install KB5086096. Install KB5086097.

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. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-26171View CVSS, KEV, EPSS, and threat context
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