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.NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 Security update
Patch Tuesday

KB5101006

KB5101006: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows 10 21H2/22H2, July 2026. Remote code execution flaw addressed; stalled requests targeted

In short

The update addresses 17 .NET Framework vulnerabilities, including a remote code execution flaw, and addresses cases where synchronous secure HTTP requests could hang. All 17 are rated Important; none are Critical.

Does it affect you? Applies to: Devices running Windows 10, version 21H2 or 22H2, with .NET Framework 3.5 or 4.8 installed.

File version
2.0.50727.9182 · 4.8.4803.0
Security
17 fixed
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • What changes KB5101006 was superseded by KB5120701 on September 25, 2026.

The official sources are linked at the end of the page.

What changes

Fixes 18 changes

.NET Framework

17 items
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-47302).1
  • A .NET Framework security feature bypass vulnerability is addressed (CVE-2026-47304).2
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50304).3
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50324).4
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50355).5
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50368).6
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50411).7
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50525).8
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50527).9
  • A .NET Framework elevation of privilege vulnerability is addressed (CVE-2026-50646).10
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50647).11
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50648).12
  • A .NET Framework remote code execution vulnerability is addressed (CVE-2026-50649).13
  • A .NET Framework elevation of privilege vulnerability is addressed (CVE-2026-50650).14
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50652).15
  • A .NET Framework denial of service vulnerability is addressed (CVE-2026-50653).16
  • A .NET Framework tampering vulnerability is addressed (CVE-2026-50659).17

.NET Libraries

  • The update addresses cases where synchronous HttpWebRequest connections could hang in certain secure connection scenarios with some server configurations.18
    Concerns synchronous HttpWebRequest connections in specific secure connection scenarios with certain server configurations.

Technical details

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

Data sheet

Released
2026-07-14
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5087064, KB5082426
Replaced by
KB5120701
VersionFile versionChannel
3.5 2.0.50727.9182 General availability
4.8 4.8.4803.0 General availability

Security

17 vulnerabilities fixed
17 important
VulnerabilitySeverityCVSS
CVE-2026-47304
.NET Security Feature Bypass Vulnerability
 Important 8.1
CVE-2026-50646
.NET Framework Remote Code Execution Vulnerability
 Important 7.8
CVE-2026-50649
.NET Remote Code Execution Vulnerability
 Important 7.8
CVE-2026-50650
.NET Framework Elevation of Privilege Vulnerability
 Important 7.8
CVE-2026-47302
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-50304
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50355
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50368
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50411
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50525
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-50527
.NET Framework Denial of Service Vulnerability
 Important 7.5
CVE-2026-50647
Active Directory Federation Server Denial of Service Vulnerability
 Important 7.5
CVE-2026-50648
.NET Framework Denial of Service Vulnerability
 Important 7.5
CVE-2026-50652
Azure Active Directory Denial of Service Vulnerability
 Important 7.5
CVE-2026-50653
Azure Active Directory Denial of Service Vulnerability
 Important 7.5
CVE-2026-50659
.NET Spoofing Vulnerability
 Important 6.5
CVE-2026-50324
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 5.9

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
78.2 MB
windows10.0-kb5101006-x64-ndp48.msu Main update · KB5101006 SHA-1: f3ef5445…11484e
Arm64 Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
49.5 MB
windows10.0-kb5101006-arm64-ndp48.msu Main update · KB5101006 SHA-1: 06b05936…39b155
x86 Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
49.5 MB
windows10.0-kb5101006-x86-ndp48.msu Main update · KB5101006 SHA-1: fea2eb4b…61c638

Updated components

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

Top changed componentsFiles
WPF42
WCF21
.NET networking9
.NET data access3

Sources

Updated
Cited passages from Microsoft's official notes (18)
  1. 1. This security update addresses a denial of service vulnerability detailed in [CVE-2026-47302.] support.microsoft.com
  2. 2. This security update addresses a security feature bypass vulnerability detailed in [CVE-2026-47304.] support.microsoft.com
  3. 3. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50304.] support.microsoft.com
  4. 4. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50324.] support.microsoft.com
  5. 5. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50355.] support.microsoft.com
  6. 6. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50368.] support.microsoft.com
  7. 7. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50411.] support.microsoft.com
  8. 8. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50525.] support.microsoft.com
  9. 9. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50527.] support.microsoft.com
  10. 10. This security update addresses an elevation of privilege vulnerability detailed in [CVE-2026-50646.] support.microsoft.com
  11. 11. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50647.] support.microsoft.com
  12. 12. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50648.] support.microsoft.com
  13. 13. This security update addresses a remote code execution vulnerability detailed in [CVE-2026-50649.] support.microsoft.com
  14. 14. This security update addresses an elevation of privilege vulnerability detailed in [CVE-2026-50650.] support.microsoft.com
  15. 15. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50652.] support.microsoft.com
  16. 16. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50653.] support.microsoft.com
  17. 17. This security update addresses a tampering vulnerability detailed in [CVE-2026-50659.] support.microsoft.com
  18. 18. - Addresses an issue with synchronous HttpWebRequest connections where requests could hang in specific secure connection scenarios with certain server configurations. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 18 quoted passages · compared with Microsoft's page on Sep 25, 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 4/5. 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