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Vulnerabilities CVE-2026-71325

CVE-2026-71325

Medium
Open
TLP:CLEAR

Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef

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Description

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.

Details

CVSS Score
4.8
EPSS Score
0.13%

3.2th percentile

CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Confidence
90%
Published
Aug 6, 2026
Last Modified
Aug 7, 2026
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