{"id":"BIT-nginx-ingress-controller-2026-24513","summary":"ingress-nginx auth-url protection bypass","details":"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.\n\nIf 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.\n\nNote 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with a broken external component.","modified":"2026-05-20T08:11:53.552421663Z","published":"2026-02-12T08:45:49.928Z","withdrawn":"2026-05-20T08:00:05.846523572Z","database_specific":{"cpes":["cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:go:*:*"],"severity":"Low"},"references":[{"type":"WEB","url":"https://github.com/kubernetes/kubernetes/issues/136679"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24513"}],"affected":[{"package":{"name":"nginx-ingress-controller","ecosystem":"Bitnami","purl":"pkg:bitnami/nginx-ingress-controller"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.13.7"},{"introduced":"1.14.0"},{"fixed":"1.14.3"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nginx-ingress-controller/BIT-nginx-ingress-controller-2026-24513.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}],"schema_version":"1.7.3"}