Authentication Bypass in Ingress-Nginx by NGINX, Inc.

CVE-2026-24513

What is CVE-2026-24513?

A vulnerability has been identified in the Ingress-Nginx controller that compromises its ability to enforce authentication properly. When configured with a specific custom-errors setting that erroneously handles HTTP error codes, it can allow unauthorized access to restricted resources. The issue arises when a default custom-errors backend is not functioning correctly, failing to adhere to the X-Code HTTP header specifications. Although the built-in custom-errors backend does not exhibit this problem, manually misconfigured setups can lead to significant security risks. This requires careful attention from administrators to prevent exploitation.

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References