CVE-2026-50524: Microsoft Security Advisory CVE-2026-50524 – .NET Denial of Service Vulnerability

July 20, 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

github.com/advisories/GHSA-w7cw-xp7h-6j5j
github.com/dotnet/announcements/issues/413
github.com/dotnet/runtime/issues/130710
github.com/dotnet/runtime/security/advisories/GHSA-w7cw-xp7h-6j5j
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50524
nvd.nist.gov/vuln/detail/CVE-2026-50524

Code Behaviors & Features

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