CVE-2026-71325
published 2026-08-06CVE-2026-71325: Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace…
PriorityP422medium4.8CVSS 4.0
AVLACLATNPRLUINVCLVILVANSCLSILSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.13%
3.1th percentile
Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| devspaces | traefik-rhel9 | — | — |
| github.com | traefik_traefik | 0 – 1.7.34 | — |
| github.com | traefik_traefik_v2 | >= 0 < 2.11.54 | 2.11.54 |
| github.com | traefik_traefik_v3 | >= 3.0.0 < 3.6.25 | 3.6.25 |
| github.com | traefik_traefik_v3 | >= 3.7.0 < 3.7.10 | 3.7.10 |
| traefik | traefik | < 2.11.54 | 2.11.54 |
| traefik | traefik | — | — |
| traefik | traefik | — | — |
CVSS provenance
nvdv4.04.8MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat4.8MEDIUM
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Red Hat
github.com/traefik/traefik: Traefik: Namespace isolation bypass via TraefikService backendRef
vendor_redhat·2026-08-06·CVSS 4.8
CVE-2026-71325 [MEDIUM] CWE-653 github.com/traefik/traefik: Traefik: Namespace isolation bypass via TraefikService backendRef
github.com/traefik/traefik: Traefik: Namespace isolation bypass via TraefikService backendRef
Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.
A flaw was found in Traefik. This flaw allows a tenant, even when restricted by Role-Based Access Control (RBAC) to a single
GHSA
Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
ghsa·2026-08-06
CVE-2026-71325 [MEDIUM] CWE-653 Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
## Summary
There is a medium severity vulnerability in Traefik's Kubernetes CRD provider. When `providers.kubernetesCRD.allowCrossNamespace` is disabled — the default — cross-namespace `@kubernetescrd` references are rejected for middlewares, TLS options and HTTP/TCP ServersTransports, but the same restriction was not applied to `TraefikService` backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a `TraefikService` owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation `allowCrossNamespace=false` is meant to enforce. Traefik v2 releases and the unmaintained v3
No detection rules found.
No public exploits indexed.
https://github.com/traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d52dhttps://github.com/traefik/traefik/releases/tag/v2.11.54https://github.com/traefik/traefik/releases/tag/v3.6.25https://github.com/traefik/traefik/releases/tag/v3.7.10https://github.com/traefik/traefik/security/advisories/GHSA-62fc-8686-hfmq
2026-08-06
Published