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.NET Framework 3.5 / 4.7.2 .NET Framework 3.5 / 4.7.2 Update
Patch Tuesday

KB5046268

KB5046268: Cumulative update for .NET Framework, versions 3.5 and 4.7.2, on Windows 10 1809 and Windows Server 2019, November 2024. Rare CLR loop and interface-call issues addressed

In short

Addresses several .NET Framework reliability issues, including a rare infinite loop when a thread first enters the CLR. It adds no new security improvements and includes previously released ones.

Does it affect you? Applies to: Devices running Windows 10, version 1809, or Windows Server 2019, with .NET Framework 3.5 or 4.7.2 installed.

File version
2.0.50727.9066 · 4.7.4121.0
Restart
Required

What changes

Fixes 5 changes

CLR

4 items

For: Applications using .NET Framework

  • A rare issue that could cause an infinite loop when a thread first enters the Common Language Runtime is addressed.1
    The issue could occur when a thread enters the CLR for the first time.
  • An issue with interface-call devirtualization is addressed in cases where JIT optimizations are enabled.2
    Addresses incorrect interface-call devirtualization when JIT optimizations are enabled.
  • An issue that could bypass a security feature when SecUtility.RandomByte is used is addressed.3
  • An information-disclosure issue involving the performance counter is addressed.4

.NET Fundamentals

For: Applications using .NET Framework

  • An issue affecting retrieval of a user's group membership through UserPrincipal.GetAuthorizationGroups is addressed.5
    The issue involves the .NET API UserPrincipal.GetAuthorizationGroups retrieving a particular user's membership.

Technical details

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

Data sheet

Released
2024-11-12
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5041913
Replaced by
KB5049608
VersionFile versionChannel
3.5 2.0.50727.9066 General availability
4.7.2 4.7.4121.0 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 Windows Server 2019 / Windows 10 Enterprise LTSC 2019
84.6 MB
windows10.0-kb5046268-x64.msu Main update · KB5046268 SHA-1: cd2f1464…3ed408
Arm64 Windows 10 Enterprise LTSC 2019
47.2 MB
windows10.0-kb5046268-arm64.msu Main update · KB5046268 SHA-1: b2ff250f…29a5d5
x86 Windows 10 Enterprise LTSC 2019
47.2 MB
windows10.0-kb5046268-x86.msu Main update · KB5046268 SHA-1: 7f3f529d…fb86c6

Updated components

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

Top changed componentsFiles
.NET runtime (CLR)18

Sources

Updated
Cited passages from Microsoft's official notes (5)
  1. 1. Address an issue where in rare cases where an infinite loop could occur when a thread enters CLR for the first time. support.microsoft.com
  2. 2. Address an issue in cases where incorrect interface call devirtualization could occur when JIT optimizations are enabled. support.microsoft.com
  3. 3. Addresses an issue with a security feature bypass vulnerability when using SecUtility.RandomByte. support.microsoft.com
  4. 4. Addresses an issue with information disclosure with the performance counter. support.microsoft.com
  5. 5. Addresses an issue with .NET API UserPrincipal.GetAuthorizationGroups to retrieve the Membership of a particular user. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 5 quoted passages · compared with Microsoft's page on Oct 20, 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 4/5, clarity 3/5, 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