Traefik 2.x < 2.11.48 / 3.x < 3.6.19 / 3.7.x < 3.7.3 Authentication Bypass (CVE-2026-48020)

The version of Traefik installed on the remote macOS host is 2.x prior to 2.11.48, 3.x prior to 3.6.19, or 3.7.x prior to 3.7.3. It is, therefore, affected by an authentication bypass vulnerability: - The StripPrefix middleware allows unauthenticated attackers to bypass route-level authentication...

Traefik 2.11.x < 2.11.38 / 3.x < 3.6.9 Connection Header Bypass

The version of Traefik installed on the remote macOS host is 2.11.x prior to 2.11.38 or 3.x prior to 3.6.9. It is, therefore, affected by a vulnerability: - A flaw exists in HTTP/1.1 request handling due to case-sensitive comparison of Connection header tokens against protected header names. An...

Improper Access Control

Traefik is vulnerable to Improper Access Control. The vulnerability is due to insufficient validation of TraefikService backend references ending with @internal, which allows an attacker with HTTPRoute creation permissions to access the internal REST provider and perform unauthorized configuratio...

Traefik 访问控制错误漏洞

Traefik is an open-source reverse proxy and load balancing tool developed by Traefik. Versions prior to Traefik 2.11.46, 3.6.17, and 3.7.1 contained a access control vulnerability. This vulnerability stemmed from the Kubernetes Gateway API provider, which allowed tenants with permission to create...

Access Control Bypass

Overview Affected versions of this package are vulnerable to Access Control Bypass in the handling of internal service references by the Gateway API provider. An attacker can gain unauthorized dynamic configuration write access by creating or updating an HTTPRoute that targets rest@internal, even...

CVE-2026-41263

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

CVE-2026-41174

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization in the createChainMiddleware function. Even when providers.kubernetesCRD.allowCrossNamespace=false is set, references in spec.chain.middlewares may be followed to access objects in other namespaces. A user with...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization in the createChainMiddleware function. Even when providers.kubernetesCRD.allowCrossNamespace=false is set, references in spec.chain.middlewares may be followed to access objects in other namespaces. A user with...

Use of Incorrectly-Resolved Name or Reference

Overview Affected versions of this package are vulnerable to Use of Incorrectly-Resolved Name or Reference in StripPrefixRegex, when used together with ForwardAuth, BasicAuth, or DigestAuth. An attacker can gain unauthorized access to protected backend resources by sending requests with...

Missing Authentication for Critical Function

Overview Affected versions of this package are vulnerable to Missing Authentication for Critical Function in the ServeHTTP function, which does not sufficiently sanitize X- alias headers. An attacker can gain unauthenticated access to protected endpoints by injecting spoofed trust context with...

Missing Authentication for Critical Function

Overview Affected versions of this package are vulnerable to Missing Authentication for Critical Function in the ServeHTTP function, which does not sufficiently sanitize X- alias headers. An attacker can gain unauthenticated access to protected endpoints by injecting spoofed trust context with...

Traefik: Pre-authentication decision bypass due to forwarded alias spoofing

Summary There is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header names e.g., X-Forwarded-Proto and does not strip or normalize alias variants that...

Insufficient Verification of Data Authenticity

Overview Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the ForwardAuth middleware when trustForwardHeader is set to false and the deployment is behind a trusted upstream proxy. An attacker can gain unauthorized access to protected backend...

CVE-2025-66490 vulnerabilities

Vulnerabilities for packages: traefik...

GHSA-CWJM-3F7H-9HWQ vulnerabilities

Vulnerabilities for packages: traefik...

CVE-2026-29054 vulnerabilities

Vulnerabilities for packages: traefik...

CVE-2026-22045 vulnerabilities

Vulnerabilities for packages: traefik...

CVE-2025-66491 vulnerabilities

Vulnerabilities for packages: traefik...

PT-2026-29940

Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField in github.com/traefik/traefik...