CVE-2026-24513
ingress-nginx auth-url protection bypass
- State
- Published
- Severity
- 3.1 Low
- Published
- Feb 3, 2026
- Updated
- Feb 18, 2026
- Reserved
- Jan 23, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.1 Low | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N | kubernetes |
Weaknesses
- CWE-754 Improper Check for Unusual or Exceptional Conditions
Affected Products
| Product | Versions |
|---|---|
ingress-nginxKubernetes |
|
References
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