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CVE-2026-24513— ingress-nginx auth-url protection bypass

Quick assessment

Affected
Kubernetes ingress-nginx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubernetes ingress-nginx是云原生计算基金会（Cloud Native Computing Foundation）开源的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 Kubernetes ingress-nginx存在安全漏洞，该漏洞源于auth-url Ingress注释的保护在特定配置错误情况下可能无效，可能导致身份验证失败时仍可访问Ingress。

CVSS 3.1 · Low EPSS 0.30% · P23

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-24513

Vulnerability Information
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Vulnerability Title
ingress-nginx auth-url protection bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes ingress-nginx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes ingress-nginx是云原生计算基金会（Cloud Native Computing Foundation）开源的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 Kubernetes ingress-nginx存在安全漏洞，该漏洞源于auth-url Ingress注释的保护在特定配置错误情况下可能无效，可能导致身份验证失败时仍可访问Ingress。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kubernetes ingress-nginx 0 ~ 1.13.7 -

II. Public POCs for CVE-2026-24513

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III. Intelligence Information for CVE-2026-24513

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Same Patch Batch · Kubernetes · 2026-02-03 · 4 CVEs total

CVE-2026-24512 8.8 HIGH ingress-nginx auth-method nginx configuration injection
CVE-2026-1580 8.8 HIGH ingress-nginx auth-method nginx configuration injection
CVE-2026-24514 6.5 MEDIUM ingress-nginx Admission Controller denial of service

IV. Related Vulnerabilities

Same product: ingress-nginx
Same vendor: Kubernetes
Same weakness: CWE-754

V. Comments for CVE-2026-24513

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