Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| Link | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d | Patch |
| https://github.com/traefik/traefik/releases/tag/v2.11.43 | Product Release Notes |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | Product Release Notes |
| https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 | Product Release Notes |
| https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq | Exploit Patch Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
01 May 2026, 17:39
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 6.4 |
| CPE | cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:* cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:* cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:* cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:* |
|
| First Time |
Traefik
Traefik traefik |
|
| References | () https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d - Patch | |
| References | () https://github.com/traefik/traefik/releases/tag/v2.11.43 - Product, Release Notes | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.6.14 - Product, Release Notes | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 - Product, Release Notes | |
| References | () https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq - Exploit, Patch, Vendor Advisory |
30 Apr 2026, 21:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-30 21:16
Updated : 2026-05-01 17:39
NVD link : CVE-2026-41174
Mitre link : CVE-2026-41174
CVE.ORG link : CVE-2026-41174
JSON object : View
Products Affected
traefik
- traefik