Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.
Metrics
Affected Vendors & Products
References
History
Fri, 23 Oct 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:traefik:traefik:3.7.0:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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Mon, 19 Oct 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Mon, 19 Oct 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation. | |
| Title | Traefik before 2.11.46, 3.6.17, and 3.7.1 Cross-Namespace Resource Reference via Kubernetes Annotations | |
| First Time appeared |
Traefik
Traefik traefik |
|
| Weaknesses | CWE-862 | |
| CPEs | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Traefik
Traefik traefik |
|
| References |
| |
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-19T19:10:55.264Z
Updated: 2026-10-19T21:16:12.196Z
Reserved: 2026-10-19T18:11:37.874Z
Link: CVE-2026-112778
Updated: 2026-10-19T21:16:07.155Z
Status : Analyzed
Published: 2026-10-19T20:17:55.187
Modified: 2026-10-23T17:04:01.690
Link: CVE-2026-112778
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