Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M
CVE-2026-54762Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails
Medium 5.9
In plain English
A medium-severity security flaw in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/traefik/traefik | no fix listed | GO-2026-5128 |
| Go | github.com/traefik/traefik/v2 | no fix listed | GO-2026-5128 |
| Go | github.com/traefik/traefik/v3 | 3.7.5 | GHSA-4mr2-fg2p-w63c |
| Go | github.com/traefik/traefik/v3 | 3.7.5 | GO-2026-5128 |
Affected products (as reported)
Weakness: CWE-636, CWE-693 · Vector: 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
References
- https://github.com/traefik/traefik/security/advisories/GHSA-4mr2-fg2p-w63c x_refsource_CONFIRM
- https://github.com/traefik/traefik/releases/tag/v3.7.5 x_refsource_MISC