CVE-2026-41174Traefik is an HTTP reverse proxy and load balancer.
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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.
- CVSS
- 6.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-653, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik | before 2.11.43; from 3.0.0 before 3.6.14; 3.7.0; 3.7.0; 3.7.0; 3.7.0 | NVD |
References
- https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414dpatch
- https://github.com/traefik/traefik/releases/tag/v2.11.43product, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.6.14product, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2product, release-notes
- https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgqexploit, patch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.