CVE-2026-50651: Microsoft Security Advisory CVE-2026-50651 – .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 HTTP client (System.Net.Http). 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 where an attacker can exploit the HTTP/2 protocol to cause an out-of-memory condition.

References

github.com/advisories/GHSA-wp74-jgxh-gv4q
github.com/dotnet/announcements/issues/422
github.com/dotnet/runtime/issues/130715
github.com/dotnet/runtime/security/advisories/GHSA-wp74-jgxh-gv4q
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50651
nvd.nist.gov/vuln/detail/CVE-2026-50651

Code Behaviors & Features

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