GHSA-6588-8gv4-xfgh: Microsoft Security Advisory CVE-2026-32203 – .NET and Visual Studio Denial of Service Vulnerability

Executive Summary: Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Xml. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in EncryptedXml class where a buffer overflow can give an attacker to the ability to perform a Denial of Service attack. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/391 CVSS Details - Version: 3.1 - Severity: High - Score: 7.5 - Vector: 7.5: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H E:U/RL:O/RC:C - Weakness: CWE-121 CWE-20: Stack-based Buffer Overflow Improper Input Validation Affected Platforms - Platforms: All - Architectures: All <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected packages versions listed below <a name=".NET 10"></a>.NET 10 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >=10.0.0, <=10.0.5; | 10.0.6 <a name=".NET 9"></a>.NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >=9.0.0, <=9.0.14; | 9.0.15 <a name=".NET 8"></a>.NET 8 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >=8.0.0, <=8.0.2; | 8.0.3 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? To update the Using the System.Security.Cryptography.xml NuGet package, use one of the following methods: NuGet Package Manager UI in Visual Studio: - Open your project in Visual Studio. - Right-click on your project in Solution Ex