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TI-2026-79155 Aliases CVE-2026-114656GHSA-rq4g-2h45-7vgr

Authentication bypass in Traefik lets clients skip mTLS checks

Priority LOW 29CWE-436Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Traefik before 2.11.58 and from 3.0.0 before 3.7.13 is affected. Negated Host matchers are counted as served domains (CWE-436), which creates a TLS options conflict that falls back to default options. An unauthenticated remote client can skip client-certificate checks and reach backends protected by RequireAndVerifyClientCert when a router rule uses !Host().

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

Description from the CNA

Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00154 4th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 2.11.58, 3.7.13

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 2.11.582.11.58Patch availableCNA
traefiktraefik3.0.0 to before 3.7.133.7.13Patch availableCNA
  • traefik Vendortraefik Affected before 2.11.58 Fixed in 2.11.58 Patch available CNA
  • traefik Vendortraefik Affected 3.0.0 to before 3.7.13 Fixed in 3.7.13 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.58; 3.0.0 to before 3.7.13Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.58; 3.0.0 to before 3.7.13 Vulnerable ·traefik

Remediation

Traefik 2.11.58 fixes the 2.x line and Traefik 3.7.13 fixes the 3.x line.

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

  • Fix · CNA traefik (traefik) Fixed in 2.11.58
  • Fix · CNA traefik (traefik) Fixed in 3.7.13

Fixed in the same release

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

  • Release ·

    traefik 2.11.58

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-79151 Authentication bypass in Traefik via shared Negotiate connection poolPriority LOW 33
    • TI-2026-79147 Authentication bypass in Traefik SNI check via HTTP/2 schemePriority LOW 32
    • TI-2026-79154 Traefik lets one service bypass another's TLS certificate checksPriority LOW 30
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-114656
  2. 2026-10-22 Alias added: GHSA-rq4g-2h45-7vgr
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-30 CVSS score added · NVD
  5. 2026-11-04 CISA SSVC decision points changed
  6. 2026-11-06 Affected versions changed · Red Hat
  7. 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