EUVD-2026-75428

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

EUVD-2026-75429

Traefik is an HTTP reverse proxy and load balancer. In Traefik v1.x, v2.x through v2.11.55, and v3.0.0 through v3.7.11, header names are canonicalized only on dashes, so X-Auth-User, XAuthUser and X.Auth.User are treated as three distinct headers by Traefik, while backends that derive variable...

CVE-2026-88878

Traefik (HTTP reverse proxy and load balancer) versions v2.8.2 through v2.11.55 and v3.0.0 through v3.7.11 are affected by an HTTP/3 timeout bypass. The respondingTimeouts settings (notably readTimeout, default 60s) are not applied to the HTTP/3 request path because readTimeout is enforced as a d...

CVE-2026-88878

Traefik is an HTTP reverse proxy and load balancer. In versions = v2.8.2 through = v3.0.0 through .transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying...

CVE-2026-88879

Traefik is an HTTP reverse proxy and load balancer. In Traefik v1.x, v2.x through v2.11.55, and v3.0.0 through v3.7.11, header names are canonicalized only on dashes, so X-Auth-User, XAuthUser and X.Auth.User are treated as three distinct headers by Traefik, while backends that derive variable...

CVE-2026-88877

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

EUVD-2026-75427

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

CVE-2026-88877

This CRITICAL (CVSS 3.1: 9.8) vulnerability affects Traefik v3.7.0 through v3.7.11, specifically its Kubernetes ingress-nginx provider . When an Ingress carries both an authentication annotation and the from-to-www-redirect annotation, the provider creates a "sibling" router that matches on host ...

CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

CVE-2026-88877

Traefik is a HTTP reverse proxy and load balancer. In versions = v3.7.0 and = v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creat...

CVE-2026-88007: Improper Authentication

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection...

PT-2026-89388

Name of the Vulnerable Software and Affected Versions Traefik versions 3.7.0 through 3.7.11 Description The Kubernetes ingress-nginx provider mishandles Ingresses that contain both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. This causes the...

PT-2026-89455

Name of the Vulnerable Software and Affected Versions Traefik versions 2.11.0 through 2.11.56 Traefik versions prior to 3.7.13 Description An authentication bypass exists in the HTTP/3 request path where the ConnContext fails to call the service.AddTransportOnContext function. This causes the...

PT-2026-89452

Name of the Vulnerable Software and Affected Versions Traefik versions 3.2.0 through 3.7.12 Description Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but fail to inspect req.Trailer. This allows an unauthenticated client to...

PT-2026-89702

Summary There is a high-severity request-smuggling vulnerability in Traefik's handling of the HTTP/1.1 Upgrade mechanism. Since Traefik moved to unencrypted HTTP/2 with prior knowledge Go 1.24, a client-initiated Upgrade: h2c request header and its connection-specific HTTP2-Settings header were...

PT-2026-89698

Summary Traefik's HTTP/3 request path did not initialize the connection-scoped backend transport holder that isolates connection-bound NTLM and Negotiate Kerberos authentication on the HTTP/1.1 and HTTP/2 paths. The HTTP/3 entrypoint reuses the HTTPS handler chain and reaches the same backend...

PT-2026-89472

Name of the Vulnerable Software and Affected Versions Traefik versions 1.x Traefik versions prior to 2.11.56 Traefik versions 3.0.0 through 3.7.11 Description Traefik fails to properly handle request headers that act as aliases for other header names. While Go treats headers like...

CVE-2026-88011: Authentication Bypass by Spoofing

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User...