Auth bypass in Traefik
CVE-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 @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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (4.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Traefik — versions < 2.11.54, >= 3.0.0, < 3.6.25, >= 3.7.0, < 3.7.10
Weakness classification (CWE)
References
- github.com/traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d52d (Patch)
- github.com/traefik/traefik/releases/tag/v2.11.54 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.6.25 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.7.10 (Release Notes)
- github.com/traefik/traefik/security/advisories/GHSA-62fc-8686-hfmq (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-71325?
- CVE-2026-71325 is a medium-severity vulnerability in Traefik, classified under CWE-653. CVSS score: 4.4/10. Published 2026-08-06.
- How severe is CVE-2026-71325?
- Medium severity. CVSS v3 base score is 4.4 out of 10.