CVE-2026-96229
Microsoft Security Advisory CVE-2026-96229 - .NET and Visual Studio Information Disclosure Vulnerability
Published Oct 13, 2026 · updated Oct 13, 2026 · Microsoft .NET 10.0
## 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. Restrictive XAML and XPS security fixes block unsafe URI fetching and navigation, propagate untrusted-input state through hyperlink navigation, add TrueType font protection and XAML nesting-depth limits, and avoid caching positive DNS zone-policy decisions. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/477 ## CVSS Details - **Version:** 3.1 - **Severity:** Moderate - **Score:** 6.5 - **Vector:** - **Weakness:** CWE-183 (Permissive List of Allowed Inputs) ## Affected Platforms - **Platforms:** Windows - **Architectures:** All ## 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](https://www.nuget.org/packages/Microsoft.WindowsDesktop.App.Runtime.win-arm64) | >= 9.0.0, = 9.0.0, = 9.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 8.0.0, = 8.0.0, = 8.0.0, How do I know if I am affected? If using a package listed in [affected packages](#affected-packages), you're exposed to the vulnerability. ### 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 command. Once you have installed the updated runtime or SDK, restart
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · Catalog
Detected
## 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. Restrictive XAML and XPS security fixes block unsafe URI fetching and navigation, propagate untrusted-input state throu
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm64 9.0.0 → 9.0.21
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x64 9.0.0 → 9.0.21
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x86 9.0.0 → 9.0.21
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm64 10.0.0 → 10.0.13
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x64 10.0.0 → 10.0.13
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x86 10.0.0 → 10.0.13
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm64 11.0.0-preview.1 → 11.0.0-rc.2
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x64 11.0.0-preview.1 → 11.0.0-rc.2
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x86 11.0.0-preview.1 → 11.0.0-rc.2
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm64 8.0.0 → 8.0.32
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x64 8.0.0 → 8.0.32
Oct 13, 2026 · Catalog
Fix available
NuGet Microsoft.WindowsDesktop.App.Runtime.win-x86 8.0.0 → 8.0.32
Oct 13, 2026 · Catalog
Updated
## 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. Restrictive XAML and XPS security fixes block unsafe URI fetching and navigation, propagate untrusted-input state throu
Affected
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm6410.0.0 → 10.0.13
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm6411.0.0-preview.1 → 11.0.0-rc.2
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm648.0.0 → 8.0.32
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-arm649.0.0 → 9.0.21
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x6410.0.0 → 10.0.13
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x6411.0.0-preview.1 → 11.0.0-rc.2
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x648.0.0 → 8.0.32
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x649.0.0 → 9.0.21
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x8610.0.0 → 10.0.13
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x8611.0.0-preview.1 → 11.0.0-rc.2
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x868.0.0 → 8.0.32
- NuGet Microsoft.WindowsDesktop.App.Runtime.win-x869.0.0 → 9.0.21
- vendor Microsoft .NET 10.0version unspecified
Sources
- CVE.orgCVE-2026-96229
Permissive list of allowed inputs in .NET allows an unauthorized attacker to disclose information over a network.
cve.org - GitHub Advisory DatabaseGHSA-5qr9-xxm9-6cmq
GitHub Advisory Database record mirrored by OSV.
github.com - OSV.devGHSA-5qr9-xxm9-6cmq
Microsoft Security Advisory CVE-2026-96229 - .NET and Visual Studio Information Disclosure Vulnerability
osv.dev