CVE-2026-50646: .NET Framework Remote Code Execution Vulnerability

Published Jul 14, 2026
·
Updated

.NET Framework Remote Code Execution Vulnerability

Other sources

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Windows Presentation Foundation (WPF). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A remote code execution vulnerability exists in Windows Presentation Foundation (WPF) in .NET 8, .NET 9, and .NET 10 when parsing specially crafted XAML input. An attacker who successfully exploits this vulnerability could execute arbitrary code in the context of the current user.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD

CVSS Details

- Version: 3.1 - Severity: High - Score: 7.8 - Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness: CWE-693 (Protection Mechanism Failure)

Affected Platforms

- Platforms: Windows - Architectures: All

<a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below

<a name=".NET 10.0"></a>.NET 10.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.9 | 10.0.10

<a name=".NET 9.0"></a>.NET 9.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.17 | 9.0.18 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.17 | 9.0.18 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.17 | 9.0.18

<a name=".NET 8.0"></a>.NET 8.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.28 | 8.0.29 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 8.0.0, <= 8.0.28 | 8.0.29 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.28 | 8.0.29

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

If using a package listed in affected packages, developers exposed to the vulnerability.

<a name="how-fix"></a>How do I fix the issue?

1. To fix the issue please install the latest version of .NET. If developers have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt them to update Visual Studio, which will also update their .NET SDKs. 2. If their application references the vulnerable nuget package, update the package reference to the patched version. Developers can list the versions they have installed by running the dotnet --info command.

Once developers have installed the updated runtime or SDK, they should restart their apps for the update to take effect.

Additionally, if they've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If anyone has found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

Direct questions about this issue to GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Users can ask questions in the linked discussion issue.

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.

External Links

CVE-2026-50646

Acknowledgements

Kevin Gosse, 41ae55e9310ff27fa6f26af4727e5590, Ky0toFu

Revisions

V1.0 (July 14, 2026): Advisory published.

— GitHub

Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

— Microsoft

Affected Software

92 affected componentsFixes available
Microsoft .NET 9.0 installed on Windows<9.0.18
9.0.18
Microsoft .NET 8.0 installed on Windows<8.0.29
8.0.29
Microsoft Visual Studio 2022=17.14
17.14.36
Microsoft Visual Studio 2022=17.12
17.12.22
Microsoft Visual Studio 2026=18.7
18.7.4
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.91684.8.9340.0
Microsoft .NET Framework=3.5
2.0.50727.8983 & 3.0.30729.8978
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
Microsoft .NET Framework=3.5
2.0.50727.8983 & 3.0.30729.8978
All of the following
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1607
Microsoft Windows 10 1607
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016
All of the following
Any of the following
Microsoft .NET Framework=4.6.2
Microsoft .NET Framework=4.7
Microsoft .NET Framework=4.7.1
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8.1
Any of the following
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 11 23h2
Microsoft Windows 11 23h2
Microsoft Windows 11 24h2
Microsoft Windows 11 24h2
Microsoft Windows 11 25h2
Microsoft Windows 11 25h2
Microsoft Windows 11 26h1
Microsoft Windows 11 26h1
Microsoft Windows Server 2022
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows Server 2019
Microsoft Windows Server 2022
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows 10 1607
Microsoft Windows 10 1607
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows Server 2016
Microsoft Windows Server 2019
All of the following
Microsoft .NET Framework=3.5
Any of the following
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
All of the following
Any of the following
Microsoft .NET>=8.0.0<8.0.29
Microsoft .NET>=9.0.0<9.0.18
Microsoft Windows
Microsoft Visual Studio 2022>=17.12.0<17.12.22
Microsoft Visual Studio 2022>=17.14.0<17.14.36
Microsoft Visual Studio 2026>=18.7.0<18.7.4
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64>=8.0.0<=8.0.28
8.0.29
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86>=8.0.0<=8.0.28
8.0.29
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64>=8.0.0<=8.0.28
8.0.29
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64>=9.0.0<=9.0.17
9.0.18
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86>=9.0.0<=9.0.17
9.0.18
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64>=9.0.0<=9.0.17
9.0.18
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64>=10.0.0<=10.0.9
10.0.10
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86>=10.0.0<=10.0.9
10.0.10
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64>=10.0.0<=10.0.9
10.0.10

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 9.0.18Patch KB5104033
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 8.0.29Patch KB5104032
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 17.14.36
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 17.12.22
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 18.7.4
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0Patch KB5100998
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0Patch KB5101003
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101000
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101005
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4143.0Patch KB5100991
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0Patch KB5099535
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0Patch KB5101006
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4143.0Patch KB5100990
  14. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101004
  15. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0Patch KB5101010
  16. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101007
  17. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101009
  18. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0Patch KB5101008
  19. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101011
  20. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101001
  21. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168Fixed in 4.8.9340.0Patch KB5101002
  22. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Patch KB5100989
  23. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978Patch KB5100985
  24. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978Patch KB5100984
  25. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  26. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  27. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  28. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  29. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  30. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  31. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  32. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  33. Upgrade

    Upgrade nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  34. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  35. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  36. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  37. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  38. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  39. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  40. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 10.0.10
  41. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 8.0.29
  42. Upgrade

    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x86 to a version that resolves this vulnerability.

    Fixed in 9.0.18
  43. Operational

    If you deploy self-contained applications targeting .NET 8, .NET 9, or .NET 10, recompile and redeploy the applications after updating to the patched .NET runtime/SDK, and restart your apps after the updated runtime or SDK is installed so the update takes effect.

Event History

Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
SeverityAffected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·07:29 PM
Data Sourced
via MITRE·07:29 PM
DescriptionSeverity
Data Sourced
via Red Hat·08:04 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·08:17 PM
RemedyDescriptionSeverityWeaknessAffected Software
Sep 8, 2026
Advisory Published
via GitHub·08:30 PM
Data Sourced
via GitHub·08:30 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2026-50646?

CVE-2026-50646 has a high severity score of 7.8.

2

How do I fix CVE-2026-50646?

To fix CVE-2026-50646, ensure that you have the latest security updates for Microsoft .NET Framework and Visual Studio.

3

What impact does CVE-2026-50646 have on my system?

CVE-2026-50646 allows unauthorized attackers to execute code remotely, potentially leading to a full system compromise.

4

Which software is affected by CVE-2026-50646?

CVE-2026-50646 affects multiple versions of Microsoft .NET Framework and Microsoft Visual Studio.

5

Is CVE-2026-50646 being actively exploited?

As of now, there have been no public reports of active exploitation for CVE-2026-50646.

Company

Resources

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