CVE-2026-58280: .NET 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

EPSS Score

1.10% (percentile: 65.0%)

Description

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

Affected Products (41)

Developer Tools

• .NET 9.0 installed on Windows
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Mac OS
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Linux
• .NET 10.0 installed on Mac OS
• .NET 11.0 installed on Windows
• .NET 11.0 installed on Linux
• .NET 11.0 installed on Mac OS
• 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 Visual Studio 2026 version 18.10
• Microsoft Visual Studio 2022 version 17.14
• 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 (25)

• 5130035
• 5130034
• 5130036
• Release Notes
• 5127689
• 5127690
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• 5127694
• Release Notes
• Release Notes
• 5127696
• 5127660
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• 5126868
• 5127666
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• 5127683
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• 5127667
• 5127668
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• 5127688

Acknowledgments

<a href="https://www.linkedin.com/in/leandrosbatista21/">Leandro Batista</a>

Revision History

• 2026-10-13: Information published.