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TI-2026-79153 Aliases CVE-2026-114641GHSA-q9pf-jh7g-83mc

Race condition in Traefik NTLM and Kerberos authentication

Priority LOW 28CWE-362Published · Updated

Key facts

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

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

Summary

Traefik from 2.11.0 before 2.11.58 and from 3.0.0 before 3.7.14 contains a race condition (CWE-362) in NTLM and Kerberos (Negotiate) backend authentication. The per-connection sticky round tripper slot is read and written without synchronization. A remote attacker can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00256 17th 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
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
traefiktraefik2.11.0 to before 2.11.582.11.58Patch availableCNA
traefiktraefik3.0.0 to before 3.7.143.7.14Patch availableCNA
  • traefik Vendortraefik Affected 2.11.0 to 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:*:*:*:*:*:*:*:*2.11.0 to before 2.11.58; 3.0.0 to before 3.7.14Vulnerabletraefik
  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions 2.11.0 to before 2.11.58; 3.0.0 to before 3.7.14 Vulnerable ·traefik

Remediation

The fixed version for the 2.11 branch is 2.11.58, and the fixed version for the 3.x branch is 3.7.14.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

  • 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-2026-79147 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-2026-114641
  2. 2026-10-22 Alias added: GHSA-q9pf-jh7g-83mc
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-28 CISA SSVC decision points changed
  5. 2026-11-07 Affected versions changed · Red Hat
  6. 2026-11-07 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