GHSA-cvvh-rhrc-wg4q Microsoft Security Advisory CVE-2026-47302 – .NET Denial of Service Vulnerability

• NuGet System.Security.Cryptography.Xml: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-arm: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-arm64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-x64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.linux-x64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.osx-arm64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.osx-x64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.win-arm: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.win-arm64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.win-x64: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet Microsoft.NetCore.App.Runtime.win-x86: >= 10.0.0, < 10.0.10 → fixed in 10.0.10 • NuGet System.Security.Cryptography.Xml: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-arm: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-arm64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-x64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.linux-x64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.osx-arm64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.osx-x64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.win-arm: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.win-arm64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.win-x64: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet Microsoft.NetCore.App.Runtime.win-x86: >= 9.0.0, < 9.0.18 → fixed in 9.0.18 • NuGet System.Security.Cryptography.Xml: >= 8.0.0, < 8.0.4 → fixed in 8.0.4 • NuGet Microsoft.NetCore.App.Runtime.linux-arm: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.linux-arm64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.linux-musl-x64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.linux-x64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.osx-arm64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.osx-x64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.win-arm: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.win-arm64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.win-x64: >= 8.0.0, < 8.0.29 → fixed in 8.0.29 • NuGet Microsoft.NetCore.App.Runtime.win-x86: >= 8.0.0, < 8.0.29 → fixed in 8.0.29

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML processing (System.Security.Cryptography.Xml, System.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A denial of service vulnerability exists in .NET 8, .NET 9, and .NET 10 related to XML processing. An attacker can exploit XML encryption handling in XML parsing to cause excessive resource consumption or application crash. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/410 CVSS Details • Version: 3.1 • Severity: High • Score: 7.5 • Vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` • Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling) Affected Platforms • Platforms: All • Architectures: All Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >= 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, .NET 9.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >= 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, .NET 8.0 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Security.Cryptography.Xml | >= 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 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, you're exposed to the vulnerability. How do I fix the issue? To update th…