CVE-2026-54762
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk7th percentile — higher than 7% of all known CVEs
Summary
In Traefik versions from 3.7.0-ea.1 to 3.7.5, a medium severity vulnerability was found in the Kubernetes Ingress NGINX provider. When an Ingress explicitly enables BasicAuth or DigestAuth via auth-type and auth-secret annotations, but the referenced Secret cannot be resolved or parsed, Traefik logs the error, skips installing the authentication middleware, and still emits a router to the backend. This results in a protected route being published without access control, allowing unauthorized access.
Risk Assessment
The organization is exposed to unauthorized access to backends intended to be protected by BasicAuth or DigestAuth. An attacker can access sensitive resources without credentials, potentially leading to data leakage or system integrity compromise.
Recommendation
Immediately update Traefik to version 3.7.5 or later. Additionally, verify that all Secrets used in auth-secret annotations are correctly configured and accessible.
Original NVD description (English source)
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.