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.NET Framework 3.5 / 4.8.1 .NET Framework 3.5 / 4.8.1 Optional preview
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KB5039865

KB5039865: Cumulative update for .NET Framework, versions 3.5 and 4.8.1, on Windows 10 22H2, June 2024. WinForms memory leaks and Azure AD certificate use addressed

In short

Addresses memory leaks involving Windows Forms accessibility objects and an issue using x509 certificates under PPL in Azure AD. It contains no new security improvements.

Does it affect you? Applies to: Devices running Windows 10 Version 22H2 with .NET Framework 3.5 or 4.8.1 installed.

File version
2.0.50727.9176 · 4.8.9251.0
Restart
Required

What changes

Fixes 2 changes

Winforms

For: Devices using Windows Forms

  • Addresses an issue involving the size of memory leaks from accessibility objects held in memory.1
    The issue is associated with AccessibleObjects held in memory due to ref-counting.

.NET Fundamentals

For: Azure AD environments using PPL

  • Addresses an issue with using x509 certificates under PPL in Azure AD.2

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-06-25
Classification
Updates
Type
Cumulative update
Restart
Required
VersionFile versionChannel
3.5 2.0.50727.9176 General availability
4.8.1 4.8.9251.0 General availability

Security

No vulnerabilities are listed for this update.

Updated components

6 files changed since the previous update for the same versions.

Top changed componentsFiles
Windows Forms3

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. Addresses an issue with the size of memory leaks associated with AccessibleObjects held in memory due to ref-counting. support.microsoft.com
  2. 2. Addresses an issue with x509 certificate use under PPL in Azure AD. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Nov 8, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake