CVE-2026-70186: 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-Oct

Released

2026-10-13

Description

Deadlock in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Affected Products (5)

Developer Tools

• Microsoft Visual Studio 2026 version 18.10
• Microsoft Visual Studio 2022 version 17.14
• ASP.NET Core 10.0
• ASP.NET Core 8.0
• ASP.NET Core 9.0

Security Updates (3)

• 5130036
• 5130034
• 5130035

Acknowledgments

<a href="https://x.com/kookiz/">Kevin Gosse</a>, <a href="https://www.linkedin.com/in/abdul-rehman---/">Muhammad Abdul Rehman</a>

Revision History

• 2026-10-13: Information published.