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TI-2026-29797 Aliases CVE-2026-41174GHSA-xhjw-95fp-8vgq

Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

Priority LOW 22CWE-653Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00254 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial traefik (traefik): 2.11.43, 3.7.0-rc.2github.com/traefik/traefik/v3 (Go): 3.7.0-rc.2, 3.6.14+1 more productRed Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
traefiktraefikbefore 2.11.43; 3.7.0-ea.1 to before 3.7.0-rc.22.11.43, 3.7.0-rc.2Patch availableCNA
—github.com/traefik/traefik/v3 (Go)3.7.0-ea.1 to before 3.7.0-rc.23.7.0-rc.2Patch availableGHSA-xhjw-95fp-8vgq
—github.com/traefik/traefik/v3 (Go)3.0.0-beta1 to before 3.6.143.6.14Patch availableGHSA-xhjw-95fp-8vgq
—github.com/traefik/traefik/v2 (Go)before 2.11.432.11.43Patch availableGHSA-xhjw-95fp-8vgq
—github.com/traefik/traefik (Go)up to 1.7.34—No fix listedGHSA-xhjw-95fp-8vgq
  • traefik Vendortraefik Affected before 2.11.43; 3.7.0-ea.1 to before 3.7.0-rc.2 Fixed in 2.11.43, 3.7.0-rc.2 Patch available CNA
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0-ea.1 to before 3.7.0-rc.2 Fixed in 3.7.0-rc.2 Patch available GHSA-xhjw-95fp-8vgq
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.0.0-beta1 to before 3.6.14 Fixed in 3.6.14 Patch available GHSA-xhjw-95fp-8vgq
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.11.43 Fixed in 2.11.43 Patch available GHSA-xhjw-95fp-8vgq
  • github.com/traefik/traefik (Go) Vendor— Affected up to 1.7.34 Fixed in — No fix listed GHSA-xhjw-95fp-8vgq

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.43; 3.0.0 to before 3.6.14Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*3.7.0 ea1Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*3.7.0 ea2Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:*3.7.0 ea3Vulnerabletraefik
cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:*3.7.0 rc1Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.43; 3.0.0 to before 3.6.14 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:* Versions 3.7.0 ea1 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:* Versions 3.7.0 ea2 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:* Versions 3.7.0 ea3 Vulnerable ·traefik
  • cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:* Versions 3.7.0 rc1 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 2.11.43, 3.7.0-rc.2
  • Fix · GHSA-xhjw-95fp-8vgq github.com/traefik/traefik/v3 (Go) Fixed in 3.7.0-rc.2 Advisory →
  • Fix · GHSA-xhjw-95fp-8vgq github.com/traefik/traefik/v3 (Go) Fixed in 3.6.14 Advisory →
  • Fix · GHSA-xhjw-95fp-8vgq github.com/traefik/traefik/v2 (Go) Fixed in 2.11.43 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41174
  2. 2026-10-03 Alias added: GHSA-xhjw-95fp-8vgq

References

Exploit 1

Patch 1

Advisory 1

Other 4

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-25774 Uncontrolled Resource Consumption in Traefik CVSS 3.1HIGH 7.5
  • TI-2025-40914 Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules CVSS 4.0MEDIUM 6.9
  • TI-2022-07529 Authorization header displayed in the debug logs CVSS 3.1MEDIUM 6.5
  • TI-2024-30459 HTTP client can remove the X-Forwarded headers in Traefik CVSS 3.1CRITICAL 9.8
  • TI-2026-60261 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect CVSS 4.0CRITICAL 9.3
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences