Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool

Summary There is a critical vulnerability in Traefik's default HTTP reverse proxy that leads to unauthenticated cross-user response poisoning. When a client opens an HTTP/2 or HTTP/3 CONNECT request, Traefik forwards it — body included — to an HTTP/1.1 upstream over a shared net/http.Transport. I...

GHSA-3CCP-42PG-HGV6 Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool

Summary There is a critical vulnerability in Traefik's default HTTP reverse proxy that leads to unauthenticated cross-user response poisoning. When a client opens an HTTP/2 or HTTP/3 CONNECT request, Traefik forwards it — body included — to an HTTP/1.1 upstream over a shared net/http.Transport. I...

Duplicate Advisory: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-8rxv-jg7p-wvg3. This link is maintained to preserve external references. Original Description Traefik versions = v3.7.0 and = v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX...

CVE-2026-67309 Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass

Traefik versions = v3.7.0 and = v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware generated from the nginx.ingress.kubernetes.io/rewrite-target annotation. When an Ingress path uses a regex that captures attacker-controlled text...

CVE-2026-67309 Traefik v3.7.0 Path Traversal via RewriteTarget Authentication Bypass

Traefik versions = v3.7.0 and = v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware generated from the nginx.ingress.kubernetes.io/rewrite-target annotation. When an Ingress path uses a regex that captures attacker-controlled text...

CVE-2026-54761

A flaw was found in Traefik, an HTTP reverse proxy and load balancer. This vulnerability exists in the Kubernetes Gateway provider's crossProviderNamespaces allowlist. A remote attacker with the ability to create an accepted HTTPRoute and a matching ReferenceGrant can exploit this by misconfiguri...

CVE-2026-65600

Traefik versions = v3.6.0 = v3.7.0 = v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator e.g. regex "^/api.", replacement "/$1...

BIT-GOLANG-2023-54365 Traefik - Denial of Service via HTTP/2 Request Handling

Traefik before 2.10.5 and 3.0.0 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2 streams t...

Improper Handling of Case Sensitivity

Overview Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity via the handling of HTTP headers in authentication middlewares. An attacker can impersonate users or escalate privileges by injecting underscore-variant headers that bypass canonical header strippin...

CVE-2026-54762 vulnerabilities

Vulnerabilities for packages: traefik-fips, traefik...

SUSE CVE-2023-54365

Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2...

CVE-2026-54762

Traefik is an HTTP reverse proxy and load balancer. From 3.7.0-ea.1 until 3.7.5, there is a medium severity vulnerability in Traefik's Kubernetes Ingress NGINX provider that causes affected routes to fail open. When an Ingress explicitly enables BasicAuth or DigestAuth through the supported...

EUVD-2026-38575

Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection SNICheck that allows an unauthenticated client to bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard...

CVE-2026-48491 Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypass

Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection SNICheck that allows an unauthenticated client to bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard...

CVE-2023-54365

Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2...

EUVD-2023-60596

Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2...

CVE-2023-54365

Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2...

CVE-2023-54365 Traefik - Denial of Service via HTTP/2 Request Handling

Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique. A remote attacker can rapidly create and cancel HTTP/2...

Exploit for CVE-2026-54761

CVE-2026-54761: Traefik Kubernetes Gateway crossProviderNamesp...

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...