{"id":"CVE-2026-24513","aliases":["GHSA-4g2f-xcph-2335","GO-2026-4419"],"url":"https://o3.security/vulnerability/CVE-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.","published":"2026-02-03T22:17:17.315Z","modified":"2026-08-12T03:51:08.260253412Z","cvss":{"score":3.1,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.003,"percentile":0.22036,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"k8s.io/ingress-nginx","fixedVersion":"1.13.7"},{"ecosystem":"Go","name":"k8s.io/ingress-nginx","fixedVersion":"1.14.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24513.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24513"},{"type":"REPORT","url":"https://github.com/kubernetes/kubernetes/issues/136679"},{"type":"PACKAGE","url":"https://github.com/kubernetes/ingress-nginx"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:08.260253412Z"}}