CVE-2026-24513: Kubernetes Ingress-Nginx

Low severity, CVSS 3.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A security issue was discovered in ingress-nginx where the protection afforded by the `auth-url` Ingress annotation may not be effective in the presence of a specific misconfiguration. If the ingress-nginx controller is configured with a default custom-errors configuration that includes HTTP errors 401 or 403, and if the configured default custom-errors backend is defective and fails to respect the X-Code HTTP header, then an Ingress with the `auth-url` annotation may be accessed even when authentication fails. Note that the built-in custom-errors backend works correctly. To trigger this issue requires an administrator to specifically configure ingress-nginx with a broken external component.

Affected products

• Kubernetes Ingress-Nginx: before 1.13.7 (fixed in 1.13.7); before 1.14.3 (fixed in 1.14.3)

Published 2026-02-03. Last modified 2026-06-17.