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TI-2026-83075 Aliases CVE-2026-119573GHSA-mvh9-fv5r-qhpj

Authorization bypass in Traefik Kubernetes Ingress NGINX provider

Priority LOW 11CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Traefik from 3.7.11 before 3.7.15 has an incorrect authorization flaw (CWE-863) in its Kubernetes Ingress NGINX provider. The cross-namespace check on the auth-tls-secret annotation is skipped when a cached client authentication TLS option is reused. A user who can create Ingresses can reference another namespace's CA secret used by another Ingress, enforce it on their own routes, and learn whether it exists, but not its contents.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Traefik 3.7.11 before 3.7.15 contains an authorization bypass in the Kubernetes Ingress NGINX provider that skips the cross-namespace check on the auth-tls-secret annotation when a cached client authentication TLS option is reused. Users who can create Ingresses can reference another namespace's CA secret already used by another Ingress, enforcing it on their own routes and learning whether it exists, without disclosure of its contents.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00261 18th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 3.7.15

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
traefiktraefik3.7.11 to before 3.7.153.7.15Patch availableCNA
  • traefik Vendortraefik Affected 3.7.11 to before 3.7.15 Fixed in 3.7.15 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*3.7.11 to before 3.7.15Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions 3.7.11 to before 3.7.15 Vulnerable ·traefik

Remediation

Upgrade Traefik to version 3.7.15, the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA traefik (traefik) Fixed in 3.7.15

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    traefik 3.7.15

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-83076 Data race in Traefik FastProxy enables unauthenticated denial of servicePriority LOW 35
    • TI-2026-83074 Authentication bypass in Traefik Ingress NGINX provider disables mTLSPriority LOW 30
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-119573
  2. 2026-10-30 CISA SSVC decision points changed
  3. 2026-10-30 Alias added: GHSA-mvh9-fv5r-qhpj
  4. 2026-11-03 CVSS score added · NVD
  5. 2026-11-06 Affected versions changed · Red Hat
  6. 2026-11-06 CVSS score added · Red Hat

References

Patch 1

  • 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