TI-2026-79150 Aliases CVE-2026-114638 GHSA-378g-rwj7-qp6j

Client CA mix-up in Traefik Ingress NGINX provider lets other CAs in

LOW 30CWE-287Published 2026-10-22 · Updated 2026-10-23

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-287.

Summary

Traefik from 3.7.0 before 3.7.14 contains an improper authentication flaw (CWE-287) in its Kubernetes Ingress NGINX provider. When auth-tls-secret names collide after dot-to-dash normalization, the provider merges client CAs, so a remote attacker holding certificates from another host's CA can access a host that requires its own client CA. Legitimate clients of that host are refused.

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

Description from the CNA

Traefik v3.7.0 before v3.7.14 contains an improper authentication vulnerability in the Kubernetes Ingress NGINX provider that merges client CAs when auth-tls-secret names collide after dot-to-dash normalization. Attackers holding certificates from another host's CA can access a host requiring its own client CA, while that host's legitimate clients are refused.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00219 12th percentileScored 2026-11-07

Fix Fixed traefik (traefik): 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

Vendor	Product	Affected versions	Fixed in	Status	Source
traefik	traefik	3.7.0 to before 3.7.14	3.7.14	Patch available	CNA

traefik Vendortraefik Affected 3.7.0 to before 3.7.14 Fixed in 3.7.14 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:traefik:traefik::::::::	3.7.0 to before 3.7.14	Vulnerable	traefik

cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions 3.7.0 to before 3.7.14 Vulnerable ·traefik

Remediation

Upgrade Traefik to version 3.7.14 or later, which fixes the flaw.

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

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 · 2026-10-22
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 →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-22 Threatist record created from CVE-2026-114638
2026-10-22 Alias added: GHSA-378g-rwj7-qp6j
2026-10-23 Priority changed: MEDIUM → LOW
2026-10-23 CISA SSVC decision points changed
2026-11-06 Affected versions changed · Red Hat
2026-11-06 CVSS score added · Red Hat

References

Advisory 1

GitHub Security Advisory (GHSA-rv2h-qh7j-xrjw)

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