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CVE-2026-54762— Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails

Quick assessment

Affected
traefik traefik
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.

Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 traefik 3.7.0-ea.1版本至3.7.5之前版本存在安全漏洞，该漏洞源于Kubernetes Ingress NGINX provider中身份验证中间件未正确安装，导致受影响的路由认证失败，可能允许未经身份验证的攻击者访问后端服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
traefik traefik >= 3.7.0-ea.1, < 3.7.5 affected
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I. Basic Information for CVE-2026-54762

Vulnerability Information
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Vulnerability Title
Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. From 3.7.0-ea.1 until 3.7.5, there is a medium severity vulnerability in Traefik's Kubernetes Ingress NGINX provider that causes affected routes to fail open. When an Ingress explicitly enables BasicAuth or DigestAuth through the supported nginx.ingress.kubernetes.io/auth-type and auth-secret annotations, but the referenced auth Secret cannot be resolved or parsed, Traefik logs the resolution error, skips installing the authentication middleware, and still emits a router to the backend service. A route that operators intended to protect is therefore published to the data plane without its authentication control, allowing unauthenticated access to the backend. The trigger is an invalid or unresolved auth dependency — a missing, malformed, unreadable, or policy-denied Secret — rather than an intentionally unprotected route. This vulnerability is fixed in 3.7.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未能安全地进行程序失效(Failing Open)
Source: CVE Program / CVE List V5
Vulnerability Title
traefik 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 traefik 3.7.0-ea.1版本至3.7.5之前版本存在安全漏洞，该漏洞源于Kubernetes Ingress NGINX provider中身份验证中间件未正确安装，导致受影响的路由认证失败，可能允许未经身份验证的攻击者访问后端服务。
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
traefik traefik >= 3.7.0-ea.1, < 3.7.5 -

II. Public POCs for CVE-2026-54762

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III. Intelligence Information for CVE-2026-54762

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Vendor Advisories for CVE-2026-54762 (1)

Vendor Pages for CVE-2026-54762 (1)

Same Patch Batch · traefik · 2026-06-23 · 6 CVEs total

CVE-2023-54365 7.5 HIGH Traefik - Denial of Service via HTTP/2 Request Handling
CVE-2026-53622 Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case ho
CVE-2026-48491 Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypas
CVE-2026-48020 Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
CVE-2026-54761 Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the al

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-636

V. Comments for CVE-2026-54762

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