CVE-2026-96236: Microsoft Security Advisory CVE-2026-96236 - ASP.NET Core Denial of Service Vulnerability

October 13, 2026 (updated October 19, 2026)

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Localization. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

ASP.NET Core request-localization fallback can add attacker-supplied synthetic culture names to the runtime’s global cache, allowing unauthenticated requests to cause unbounded memory growth and denial of service.

References

Code Behaviors & Features

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