CVE-2026-50524: Microsoft Security Advisory CVE-2026-50524 – .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 .NET TLS/SSL (System.Net.Security). 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 when processing TLS handshakes. An attacker can send a malformed request and cause application to crash or become unresponsive.

References

Code Behaviors & Features

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