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Microsoft Security Advisory CVE-2026-62901: .NET Denial of Service Vulnerability

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Evaluación

Dificultad
2/5
Tiempo estimado
Menos de una hora
Aptitud para principiantes
8/100
Tipo de issue
Documentación
Claridad
Necesita aclaración
Estado de actividad
Tranquilo
Área
security

Línea de trabajo

This is a maintainer-authored security advisory with no code to change, and it links discussion to the PowerShell and dotnet/runtime repositories. The unfinished TBD comments mark the summary, the acknowledgments and the revision date, but the payload does not say what a contributor should change. Confirm the intended edits with the maintainers before touching the text, and send questions to the linked discussion threads.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

PowerShell Security

Microsoft Security Advisory CVE-2026-62901: .NET Denial of Service Vulnerability

Executive Summary

Microsoft is releasing this security advisory to provide information about a vulnerability in System.Net.WebSockets. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

An unchecked input for loop condition in .NET allows an unauthorized attacker to deny service over a network.

System administrators are advised to update PowerShell 7 to an unaffected version (see affected software).

Discussion

Please open a support question to discuss the PowerShell aspects of this advisory.
Please use https://github.com/dotnet/runtime/issues/132156 for discussion of the .NET Runtime aspects this advisory.

Affected Software

The vulnerability affects PowerShell 7 prior to the following versions:

PowerShell 7 Version Affected version Patched Version
7.6 <7.6.5 7.6.5
7.5 <7.5.10 7.5.10
7.4 <7.4.19 7.4.19

The vulnerability affects PowerShell when running on the following operating systems:

Operating System Affected
Windows Yes
macOS Yes
Linux Yes

Advisory FAQ

How do I know if I am affected?

If all of the following are true:

  1. Run pwsh -v, then, check the version in the table in Affected Software to see if your version of PowerShell 7 is affected.
How do I update to an unaffected version?

Follow the instructions at Installing PowerShell 7 to install the latest version of PowerShell 7.

Updating PowerShell 7 using Microsoft Update

Updating PowerShell 7 using Microsoft Update

Other Information

Reporting Security Issues

If you have found a potential security issue in PowerShell 7,
please email details to [email protected].

Support

You can ask questions about this issue on GitHub in the PowerShell organization.
This is located at https://github.com/PowerShell/.
The Announcements repo (https://github.com/PowerShell/Announcements)
will contain this bulletin as an issue and will include a link to a discussion issue where you can ask questions.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

What if the update breaks my script or module?

You can uninstall the newer version of PowerShell 7 and install the previous version of PowerShell 7.
This should be treated as a temporary measure.
Therefore, the script or module should be updated to work with the patched version of PowerShell 7.

Acknowledgments

Kevin Gosse; hamayanhamayan

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure.

See acknowledgments for more information.

External Links

CVE-2026-62901

Revisions

V1.0 (August 17, 2026): Advisory published.

Version 1.0
Last Updated 2026-08-17

Lenguaje dominante
Sin datos de lenguaje
Estrellas
20
Forks
8
Sin PR fusionados en 30 d

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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