CVE-2026-96960: .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

Description

Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a network.

Affected Products (39)

Other

  • System.Security.Cryptography.Xml on .NET 10.0 installed on Windows
  • System.Security.Cryptography.Xml on .NET 10.0 installed on Linux
  • System.Security.Cryptography.Xml on .NET 10.0 installed on Mac OS
  • System.Security.Cryptography.Xml on .NET 11.0 installed on Windows
  • System.Security.Cryptography.Xml on .NET 11.0 installed on Linux
  • System.Security.Cryptography.Xml on .NET 11.0 installed on Mac OS
  • System.Security.Cryptography.Xml on .NET 8.0 installed on Windows
  • System.Security.Cryptography.Xml on .NET 8.0 installed on Linux
  • System.Security.Cryptography.Xml on .NET 8.0 installed on Mac OS
  • System.Security.Cryptography.Xml on .NET 9.0 installed on Windows
  • System.Security.Cryptography.Xml on .NET 9.0 installed on Linux
  • System.Security.Cryptography.Xml on .NET 9.0 installed on Mac OS

Developer Tools

  • 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
  • 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

Security Updates (20)

Acknowledgments

<a href="https://x.com/soaj1664ashar">Dr.-Ing Ashar Javed</a>, Coşkun Bağrıa&#231;ık

Revision History

  • 2026-10-13: Information published.