CVE-2026-71325
Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
MEDIUM 4.8EPSS 0.2%
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
- traefik
- CVSS v4.0 GITHUB
- 4.8 MEDIUM
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/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 - CVSS v4.0 GitHub
- 4.8 MEDIUM
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 - CVSS v3.1 NVD
- 4.4 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - EPSS
- 0.15% chance of exploitation in the next 30 days, 4th percentile
- Published
- 2026-08-06
- Updated
- 2026-08-07
Proof-of-concept exploits (1)
Security advisories
- traefik/traefik/security/advisories/GHSA-62fc-8686-hfmq
- traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d52d