Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.
Metrics
Affected Vendors & Products
References
History
Tue, 08 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Fri, 04 Sep 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend. | |
| Title | Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware | |
| First Time appeared |
Traefik
Traefik traefik |
|
| Weaknesses | CWE-639 | |
| CPEs | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Traefik
Traefik traefik |
|
| References |
| |
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-04T11:29:58.771Z
Updated: 2026-09-08T14:47:37.976Z
Reserved: 2026-09-04T10:59:00.162Z
Link: CVE-2026-85594
Updated: 2026-09-08T14:47:33.626Z
Status : Awaiting Analysis
Published: 2026-09-04T12:17:22.830
Modified: 2026-09-08T20:10:30.270
Link: CVE-2026-85594
No data.