TI-2026-39570 Aliases CVE-2026-54764 GHSA-3q9r-p662-5j8m

ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

LOW 36CWE-345Published 2026-07-06 · Updated 2026-07-07

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: None · None · None
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-345.

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00281 20th percentileScored 2026-11-07

Fix Partial traefik (traefik): 2.11.51, 3.6.22, 3.7.6github.com/traefik/traefik/v2 (Go): 2.11.51+1 more productRed Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
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	before 2.11.51; 3.0.0 to before 3.6.22; 3.7.0 to before 3.7.6	2.11.51, 3.6.22, 3.7.6	Patch available	CNA
—	github.com/traefik/traefik/v2 (Go)	before 2.11.51	2.11.51	Patch available	GHSA-3q9r-p662-5j8m
—	github.com/traefik/traefik/v3 (Go)	before 3.6.22	3.6.22	Patch available	GHSA-3q9r-p662-5j8m
—	github.com/traefik/traefik/v3 (Go)	3.7.0 to before 3.7.6	3.7.6	Patch available	GHSA-3q9r-p662-5j8m
—	github.com/traefik/traefik (Go)	up to 1.7.34	—	No fix listed	GHSA-3q9r-p662-5j8m

traefik Vendortraefik Affected before 2.11.51; 3.0.0 to before 3.6.22; 3.7.0 to before 3.7.6 Fixed in 2.11.51, 3.6.22, 3.7.6 Patch available CNA
github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.11.51 Fixed in 2.11.51 Patch available GHSA-3q9r-p662-5j8m
github.com/traefik/traefik/v3 (Go) Vendor— Affected before 3.6.22 Fixed in 3.6.22 Patch available GHSA-3q9r-p662-5j8m
github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0 to before 3.7.6 Fixed in 3.7.6 Patch available GHSA-3q9r-p662-5j8m
github.com/traefik/traefik (Go) Vendor— Affected up to 1.7.34 Fixed in — No fix listed GHSA-3q9r-p662-5j8m

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:traefik:traefik::::::::	before 2.11.51; 3.0.0 to before 3.6.22; 3.7.0 to before 3.7.6	Vulnerable	traefik

cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.11.51; 3.0.0 to before 3.6.22; 3.7.0 to before 3.7.6 Vulnerable ·traefik

Remediation

Fix · CNA traefik (traefik) Fixed in 2.11.51, 3.6.22, 3.7.6
Fix · GHSA-3q9r-p662-5j8m github.com/traefik/traefik/v2 (Go) Fixed in 2.11.51 Advisory →
Fix · GHSA-3q9r-p662-5j8m github.com/traefik/traefik/v3 (Go) Fixed in 3.6.22 Advisory →
Fix · GHSA-3q9r-p662-5j8m github.com/traefik/traefik/v3 (Go) Fixed in 3.7.6 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat OpenShift Dev Spaces	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-54764
2026-10-03 Alias added: GHSA-3q9r-p662-5j8m

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-54764

Other 5

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

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