Read the docs
TI-2026-49982 Aliases CVE-2026-71325GHSA-62fc-8686-hfmq

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

Priority LOW 21CWE-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
Low · Low · None
Fix status
Fixed

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

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00155 4th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 2.11.54, 3.6.25, 3.7.10github.com/traefik/traefik/v2 (Go): 2.11.54+1 more productRed Hat: 1 advisory

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 2.11.54; 3.0.0 to before 3.6.25; 3.7.0 to before 3.7.102.11.54, 3.6.25, 3.7.10Patch availableCNA
—github.com/traefik/traefik/v2 (Go)before 2.11.542.11.54Patch availableGHSA-62fc-8686-hfmq
—github.com/traefik/traefik/v3 (Go)3.0.0 to before 3.6.253.6.25Patch availableGHSA-62fc-8686-hfmq
—github.com/traefik/traefik/v3 (Go)3.7.0 to before 3.7.103.7.10Patch availableGHSA-62fc-8686-hfmq
—github.com/traefik/traefik (Go)up to 1.7.34—No fix listedGHSA-62fc-8686-hfmq
  • traefik Vendortraefik Affected before 2.11.54; 3.0.0 to before 3.6.25; 3.7.0 to before 3.7.10 Fixed in 2.11.54, 3.6.25, 3.7.10 Patch available CNA
  • github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.11.54 Fixed in 2.11.54 Patch available GHSA-62fc-8686-hfmq
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.0.0 to before 3.6.25 Fixed in 3.6.25 Patch available GHSA-62fc-8686-hfmq
  • github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0 to before 3.7.10 Fixed in 3.7.10 Patch available GHSA-62fc-8686-hfmq
  • github.com/traefik/traefik (Go) Vendor— Affected up to 1.7.34 Fixed in — No fix listed GHSA-62fc-8686-hfmq

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.54; 3.0.0 to before 3.6.25; 3.7.0 – 3.7.10Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.54; 3.0.0 to before 3.6.25; 3.7.0 – 3.7.10 Vulnerable ·traefik

Remediation

  • Fix · CNA traefik (traefik) Fixed in 2.11.54, 3.6.25, 3.7.10
  • Fix · GHSA-62fc-8686-hfmq github.com/traefik/traefik/v2 (Go) Fixed in 2.11.54 Advisory →
  • Fix · GHSA-62fc-8686-hfmq github.com/traefik/traefik/v3 (Go) Fixed in 3.6.25 Advisory →
  • Fix · GHSA-62fc-8686-hfmq github.com/traefik/traefik/v3 (Go) Fixed in 3.7.10 Advisory →

Red Hat 1 advisory

  • RHSA-2026:90321 Released 2026-10-26 · Red Hat rating Critical
    Red Hat OpenShift Dev Spaces 3.31.0 Release.
    • Red Hat OpenShift Dev Spaces 3.31 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/jetbrains-ide-rhel9 +8

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat OpenShift Dev Spaces 3.31Fixed RHSA-2026:90321
Not affected: 2 products
  • Red Hat OpenShift Dev Spaces 3.31
  • Red Hat OpenShift GitOps

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71325
  2. 2026-10-03 Alias added: GHSA-62fc-8686-hfmq
  3. 2026-10-29 Fix available: Red Hat OpenShift Dev Spaces 3.31 · Red Hat
  4. 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat

References

Patch 2

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