TI-2026-39567 Aliases CVE-2026-54761 GHSA-3g6v-2r68-prfc

Improper access control in traefik

LOW 27CWE-284Published 2026-06-23 · Updated 2026-06-25

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: High · Low · 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-284.

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own namespace. As a result, an HTTPRoute created in a namespace that is not allow-listed can reference a cross-provider TraefikService such as api@internal, dashboard@internal or rest@internal by pointing backendRef.namespace at an allow-listed namespace covered by a Gateway API ReferenceGrant, exposing internal Traefik services on the data plane. Exploitation requires the ability to create an accepted HTTPRoute and a matching ReferenceGrant from an allow-listed namespace; it does not require any change to Traefik static configuration, RBAC, or the deployment itself. This vulnerability is fixed in 3.6.21 and 3.7.5.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00369 30th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial traefik (traefik): 3.6.21, 3.7.5github.com/traefik/traefik/v3 (Go): 3.6.21, 3.7.5Red Hat: 1 without a fix

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	before 3.6.21; 3.7.0-ea.1 to before 3.7.5	3.6.21, 3.7.5	Patch available	CNA
—	github.com/traefik/traefik/v3 (Go)	before 3.6.21	3.6.21	Patch available	GHSA-3g6v-2r68-prfc
—	github.com/traefik/traefik/v2 (Go)	up to 2.11.50	—	No fix listed	GHSA-3g6v-2r68-prfc
—	github.com/traefik/traefik (Go)	up to 1.7.34	—	No fix listed	GHSA-3g6v-2r68-prfc
—	github.com/traefik/traefik/v3 (Go)	3.7.0-ea.1 to before 3.7.5	3.7.5	Patch available	GHSA-3g6v-2r68-prfc

traefik Vendortraefik Affected before 3.6.21; 3.7.0-ea.1 to before 3.7.5 Fixed in 3.6.21, 3.7.5 Patch available CNA
github.com/traefik/traefik/v3 (Go) Vendor— Affected before 3.6.21 Fixed in 3.6.21 Patch available GHSA-3g6v-2r68-prfc
github.com/traefik/traefik/v2 (Go) Vendor— Affected up to 2.11.50 Fixed in — No fix listed GHSA-3g6v-2r68-prfc
github.com/traefik/traefik (Go) Vendor— Affected up to 1.7.34 Fixed in — No fix listed GHSA-3g6v-2r68-prfc
github.com/traefik/traefik/v3 (Go) Vendor— Affected 3.7.0-ea.1 to before 3.7.5 Fixed in 3.7.5 Patch available GHSA-3g6v-2r68-prfc

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:traefik:traefik::::::::	before 3.6.21; 3.7.0 to before 3.7.5	Vulnerable	traefik

cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 3.6.21; 3.7.0 to before 3.7.5 Vulnerable ·traefik

Remediation

Fix · CNA traefik (traefik) Fixed in 3.6.21, 3.7.5
Fix · GHSA-3g6v-2r68-prfc github.com/traefik/traefik/v3 (Go) Fixed in 3.6.21 Advisory →
Fix · GHSA-3g6v-2r68-prfc github.com/traefik/traefik/v3 (Go) Fixed in 3.7.5 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-2026-54761
2026-10-03 Alias added: GHSA-3g6v-2r68-prfc

References

Exploit 1

https://github.com/traefik/traefik/security/advisories/GHSA-3g6v-2r68-prfc

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-54761

Other 1

https://github.com/traefik/traefik

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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