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TI-2026-79147 Aliases CVE-2026-114635GHSA-m6hw-6pp7-2ffc

Authentication bypass in Traefik SNI check via HTTP/2 scheme

Priority LOW 32CWE-288Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-288.

Summary

Traefik before 2.11.58 and from 3.0.0 before 3.7.14 contains an authentication bypass in its SNI check, which is skipped when the request TLS state is nil (CWE-288). An unauthenticated remote attacker can send HTTP/2 requests over TLS on Go 1.27 builds to reach routers that require client certificates without presenting one.

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

Description from the CNA

Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is skipped when request TLS state is nil. Unauthenticated clients can send HTTP/2 requests with the :scheme http pseudo-header over TLS on Go 1.27 builds to reach routers requiring client certificates without presenting one.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Fix Fixed traefik (traefik): 2.11.58, 3.7.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 3.7.143.7.14Patch availableCNA
  • traefik Vendortraefik Affected before 2.11.58 Fixed in 2.11.58 Patch available CNA
  • traefik Vendortraefik Affected 3.0.0 to before 3.7.14 Fixed in 3.7.14 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*before 2.11.58; 3.0.0 to before 3.7.14Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.58; 3.0.0 to before 3.7.14 Vulnerable ·traefik

Remediation

Upgrade Traefik 2.x to version 2.11.58 and Traefik 3.x to version 3.7.14.

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 3.7.14

Fixed in the same release

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

  • Release ·

    traefik 3.7.14

    8 records Highest priority Priority LOW 8 LOW

    Other records, highest priority first

    • TI-2026-79151 Authentication bypass in Traefik via shared Negotiate connection poolPriority LOW 33
    • TI-2026-79149 Authentication bypass in Traefik FastProxy connection poolPriority LOW 33
    • TI-2026-79152 Traefik Ingress-NGINX provider lets attackers spoof mTLS client headersPriority LOW 32
    Show all 8 records →
  • 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-2026-79154 Traefik lets one service bypass another's TLS certificate checksPriority LOW 30
    • TI-2026-79155 Authentication bypass in Traefik lets clients skip mTLS checksPriority LOW 29
    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-2026-114635
  2. 2026-10-22 Alias added: GHSA-m6hw-6pp7-2ffc
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed
  5. 2026-11-06 Affected versions changed · Red Hat
  6. 2026-11-06 CVSS score added · Red Hat

References

Advisory 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