CVE-2026-45591: ASP.NET Core Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jun

Released

2026-06-09

Description

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

Affected Products (13)

Developer Tools

• Microsoft Visual Studio 2026 version 18.6
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Mac OS
• ASP.NET Core 10.0
• .NET 10.0 installed on Linux
• ASP.NET Core 8.0
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .NET 9.0 installed on Mac OS
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Windows
• ASP.NET Core 9.0

Security Updates (4)

• Release Notes
• 5097148
• 5097149
• 5097150

Acknowledgments

Anonymous

Revision History

• 2026-06-09: Information published.