CVE-2026-57108: Microsoft Security Advisory CVE-2026-57108 – .NET Denial of Service Vulnerability

July 20, 2026 (updated November 4, 2026)

Microsoft is releasing this security advisory to provide information about a vulnerability in the .NET runtime cryptography layer (CryptoNative_GetX509NameInfo). 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 .NET 8, .NET 9, and .NET 10 runtime when parsing X.509 certificates. A specially crafted certificate could allow an attacker to cause a denial of service.

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Code Behaviors & Features

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