Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Improvements and fixes

  • Addresses an issue in the Universal C Runtime (CRT) in which a race condition occurs when you update the global locale. This condition corrupts the current locale reference count and triggers a double free condition.

  • Addresses an issue in which the Universal CRT experiences decreased performance in the _gcvt and _gcvt_s functions.

  • Addresses an issue in the Universal CRT for the standard error (STDERR) stream in which the output to a file or pipe is fully buffered.

  • Addresses an issue in the Universal CRT by adding the "x" access mode flag to support the fopen() function.

How to get this update

Method 1: Windows Update

This update is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the terminology that Microsoft uses to describe software updates.

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?

Thank you for your feedback!