CVE-2026-47302: Microsoft .NET denial of service via resource exhaustion

CVE-2026-47302 · Severity: high · CVSS 7.5 · Published 2026-07-14

A security vulnerability has been identified in Microsoft .NET, a widely used framework for building and running applications. The flaw exists in how the system processes XML data, specifically during encryption handling. An attacker could exploit this to cause the application to consume excessive resources or crash, leading to a denial of service that disrupts business operations and application availability.

Technologies: Microsoft .NET Framework, Microsoft.NetCore.App.Runtime.linux-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet), Microsoft.NetCore.App.Runtime.linux-x64 (NuGet), Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet), Microsoft.NetCore.App.Runtime.osx-x64 (NuGet), Microsoft.NetCore.App.Runtime.win-arm (NuGet), Microsoft.NetCore.App.Runtime.win-arm64 (NuGet), Microsoft.NetCore.App.Runtime.win-x64 (NuGet), Microsoft.NetCore.App.Runtime.win-x86 (NuGet), System.Security.Cryptography.Xml (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-47302 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-47302 being exploited in the wild.
How severe is CVE-2026-47302?
High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?
Microsoft .NET Framework 3.5, 4.7.2, 4.8; Microsoft.NetCore.App.Runtime >= 8.0.0, <= 8.0.28; >= 9.0.0, <= 9.0.17; >= 10.0.0, <= 10.0.9; Microsoft.NetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.10; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.10; and 11 more.
Is there a fix for CVE-2026-47302?
Yes. Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.10 or later; System.Security.Cryptography.Xml (NuGet): upgrade to 10.0.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-47302 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-47302?
Check whether you run Microsoft .NET Framework, Microsoft.NetCore.App.Runtime, Microsoft.NetCore.App.Runtime.linux-arm (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x86 --version 10.0.10
  • System.Security.Cryptography.Xml (NuGet): upgrade to 10.0.10 or later
    dotnet add package System.Security.Cryptography.Xml --version 10.0.10

Technical details

A denial of service vulnerability (CWE-770) exists in .NET's XML processing components, specifically within System.Security.Cryptography.Xml and System.Xml. The root cause is improper resource limit enforcement during the handling of XML encryption during parsing. A remote, unauthenticated attacker can exploit this by providing specially crafted XML content, leading to excessive resource consumption or an application crash. The vulnerability affects .NET 8, 9, and 10 across all platforms and architectures. Patches are available in .NET versions 8.0.29, 9.0.18, and 10.0.10, as well as updated NuGet packages for System.Security.Cryptography.Xml.

Affected products

  • Microsoft .NET 8.0, 9.0, 10.0
  • Microsoft System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.28; >= 9.0.0, <= 9.0.17; >= 10.0.0, <= 10.0.9
  • Microsoft Microsoft.NetCore.App.Runtime >= 8.0.0, <= 8.0.28; >= 9.0.0, <= 9.0.17; >= 10.0.0, <= 10.0.9

Identifiers

  • CVE-2026-47302
  • GHSA-cvvh-rhrc-wg4q

Timeline

  • 2026-07-14: advisory: Initial advisory publication
  • 2026-07-20: advisory: Advisory updated

References

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