CVE-2026-70174: .NET Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

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

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

Improperly implemented security check for standard in .NET allows an unauthorized attacker to execute code over a network.

FAQ

According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution? This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.

Affected Products (33)

Developer Tools

• Microsoft Visual Studio 2026 version 18.10
• .NET 11.0 installed on Windows
• Microsoft Visual Studio 2022 version 17.14
• .NET 10.0 installed on Windows
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025
• Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
• Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2
• Microsoft .NET Framework 3.5 on Windows 11 version 26H1
• Microsoft .NET Framework 3.5 on Windows Server 2012
• Microsoft .NET Framework 3.5 on Windows Server 2012 R2
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019
• Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
• Microsoft .NET Framework 4.8 on Windows 10 version 1607
• Microsoft .NET Framework 4.8 on Windows Server 2012
• Microsoft .NET Framework 4.8 on Windows Server 2012 R2
• Microsoft .NET Framework 4.8 on Windows Server 2016

Security Updates (23)

• Release Notes
• 5130036
• 5130034
• 5130035
• 5127689
• 5127690
• 5127691
• 5127692
• 5127693
• 5127694
• 5127696
• 5127660
• 5127664
• 5126868
• 5127666
• 5127685
• 5127683
• 5127687
• 5127667
• 5127668
• 5127684
• 5127686
• 5127688

Acknowledgments

<a href="https://x.com/ky0tofu">Ky0toFu</a>, <a href="https://www.linkedin.com/in/nguyen-hoang-quoc-an-009863267/">kayiz</a> with <a href="http://lp.com.vn/">Lien Phat Technology Corporation</a>, nono, <a href="https://www.linkedin.com/in/leandrosbatista21/">Leandro Batista</a>, <a href="https://www.linkedin.com/in/kevin-sch/">Kevin Schmidt</a>, <a href="https://www.linkedin.com/in/rolf-z-67962959/">Rolf Zengafinnen</a>, <a href="https://www.linkedin.com/in/nguyen-hoang-quoc-an-009863267/">kayiz</a> with <a href="http://lp.com.vn/">Lien Phat Technology Corporation</a>, <a href="https://www.linkedin.com/in/abdul-rehman---/">Muhammad Abdul Rehman</a>, <a href="https://x.com/m4x_1997">Aobo Wang</a>, <a href="https://x.com/bbznop">bbznop</a>

Revision History

• 2026-10-13: Information published.