CVE-2026-50525: Microsoft Security Advisory CVE-2026-50525 – .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 Encryption (System.Security.Cryptography.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 the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability by supplying crafted encrypted XML that causes uncontrolled resource consumption, resulting in denial of service.

References

github.com/advisories/GHSA-8q5v-6pqq-x66h
github.com/dotnet/announcements/issues/414
github.com/dotnet/runtime/issues/130711
github.com/dotnet/runtime/security/advisories/GHSA-8q5v-6pqq-x66h
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50525
nvd.nist.gov/vuln/detail/CVE-2026-50525

Code Behaviors & Features

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