CVE-2026-56170: 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-Jul

Released

2026-07-14

Description

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

Affected Products (8)

Developer Tools

• .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

Security Updates (3)

• 5104034
• 5104032
• 5104033

Acknowledgments

Ky0toFu

Revision History

• 2026-07-14: Information published.