CVE-2026-47302: Microsoft Security Advisory CVE-2026-47302 – .NET Denial of Service Vulnerability

July 20, 2026 (updated July 21, 2026)

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.

References

github.com/advisories/GHSA-cvvh-rhrc-wg4q
github.com/dotnet/announcements/issues/410
github.com/dotnet/runtime/issues/130708
github.com/dotnet/runtime/security/advisories/GHSA-cvvh-rhrc-wg4q
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47302
nvd.nist.gov/vuln/detail/CVE-2026-47302

Code Behaviors & Features

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