CVE-2026-85363: .NET Framework Elevation of Privilege Vulnerability
.NET Framework Elevation of Privilege Vulnerability
Other sources
Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.WindowsDesktop.App.Runtime (WPF). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
Attacker-controlled XPS glyph coordinates can overflow destination pointer arithmetic in CD3DGlyphBank::RectFillAlpha, causing an out-of-bounds write and process termination.
Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/469
CVSS Details
- Version: 3.1 - Severity: High - Score: 8.8 - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness: CWE-190 (Integer Overflow or Wraparound) Affected Platforms
- Platforms: Windows - Architectures: All
<a name="affected-packages"></a>Affected Packages
The vulnerability affects Microsoft .NET projects that use an affected package version listed below.
Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.20 | 9.0.21 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.20 | 9.0.21 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.20 | 9.0.21 Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2
Advisory FAQ
<a name="how-affected"></a>How do I know if I am affected?
If using a package listed in affected packages, you're 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 you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs. 2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the dotnet --info command.
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.
Additionally, if you'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 you have 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
You can ask questions about this issue on 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. You 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-2026-85363
Acknowledgements
- Ky0toFu (@ky0tofu)
Revisions
V1.0 (10/13/2026): Advisory published.
— GitHub
Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to elevate privileges over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127660 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 18.10.4 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.13Patch KB5130036 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127690 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127683 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.8.4811.0Patch KB5127686 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Patch KB5127685 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127692 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Patch KB5127666 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.8.4811.0Patch KB5127684 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.8.4811.0Patch KB5127688 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.7.4150.0Patch KB5127668 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0Patch KB5127687 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.7.4150.0Patch KB5127667 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 9.0.21Patch KB5130035 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171Patch KB5127696 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.8987 AND 3.0.30729.8982Patch KB5127664 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 4.8.9363.0Patch KB5127691 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0Patch KB5127694 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 11.0.0-rc.2 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127693 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Patch KB5127689 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.0.32Patch KB5130034 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 17.14.42 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 11.0.0-rc.2 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64to a version that resolves this vulnerability.Fixed in 11.0.0-rc.2 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64to a version that resolves this vulnerability.Fixed in 11.0.0-rc.2 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 9.0.21 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64to a version that resolves this vulnerability.Fixed in 9.0.21 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64to a version that resolves this vulnerability.Fixed in 9.0.21 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 10.0.13 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64to a version that resolves this vulnerability.Fixed in 10.0.13 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64to a version that resolves this vulnerability.Fixed in 10.0.13 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 8.0.32 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-x64to a version that resolves this vulnerability.Fixed in 8.0.32 - Upgrade
Upgrade
nuget/Microsoft.WindowsDesktop.App.Runtime.win-arm64to a version that resolves this vulnerability.Fixed in 8.0.32 - Upgrade
Upgrade
Microsoft.WindowsDesktop.App.Runtime.win-arm64, Microsoft.WindowsDesktop.App.Runtime.win-x64, Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 8.0.32 - Upgrade
Upgrade
Microsoft.WindowsDesktop.App.Runtime.win-arm64, Microsoft.WindowsDesktop.App.Runtime.win-x64, Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 9.0.21 - Upgrade
Upgrade
Microsoft.WindowsDesktop.App.Runtime.win-arm64, Microsoft.WindowsDesktop.App.Runtime.win-x64, Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 10.0.13 - Upgrade
Upgrade
Microsoft.WindowsDesktop.App.Runtime.win-arm64, Microsoft.WindowsDesktop.App.Runtime.win-x64, Microsoft.WindowsDesktop.App.Runtime.win-x86to a version that resolves this vulnerability.Fixed in 11.0.0-rc.2 - Operational
Recompile and redeploy self-contained applications targeting the impacted .NET versions.
- Operational
Restart applications after installing the updated runtime or SDK.
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
The CVSS vector indicates network reachability, low attack complexity, no required privileges, and required user interaction. The available data does not specify what form that interaction takes.
What could be affected if exploitation succeeds?
The CVSS vector rates confidentiality, integrity, and availability impact as high. Successful exploitation is described as allowing an unauthorized attacker to elevate privileges.