EUVD-2026-75578
GHSA-f52w-8j3h-j724
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5DescriptionCVE.org
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.
AnalysisAI
HTTP/1 request-target parsing in Traefik prior to 2.11.57 and 3.7.13 allows unauthenticated remote attackers to send a rootless URL target (e.g., http:example.com/admin) that Go's HTTP library stores in URL.Opaque rather than URL.Path, leaving URL.Path empty. Traefik's routing engine, forwardAuth middleware, and access logger all evaluate against the normalized empty path (treated as /), while URL.RequestURI() gives URL.Opaque precedence when forwarding — meaning the backend receives the original opaque target verbatim. …
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Recommended ActionAI
Within 24 hours: inventory all Traefik deployments and identify instances running versions before 2.11.57 or 3.7.13 to determine patch scope. …
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Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Backend connection hijacking in Traefik reverse proxy (2.11.0 through 2.11.56 and 3.0.0 through 3.7.12) lets an unauthen
Route-level authentication bypass in Traefik v3.7.0-v3.7.7 allows unauthenticated remote attackers to reach backend endp
Traefik is an open source HTTP reverse proxy and load balancer. Rated high severity (CVSS 7.5), this vulnerability is re
types/types.go in Containous Traefik 1.7.x through 1.7.11, when the --api flag is used and the API is publicly reachable
Security middleware bypass in Traefik reverse proxy versions 2.11.26-2.11.56 and 3.4.2-3.7.12 allows unauthenticated net
Traefik's header-security defenses (aliasHeadersStrategy, underscoreHeadersStrategy, forwardedHeaders) inspect req.Heade
Traefik is an open source HTTP reverse proxy and load balancer. Rated medium severity (CVSS 6.5), this vulnerability is
Traefik is an open source HTTP reverse proxy and load balancer. Rated medium severity (CVSS 6.5), this vulnerability is
Authentication bypass in Traefik v3.7.0 through v3.7.11 lets remote unauthenticated attackers reach protected Kubernetes
Authentication bypass in Traefik reverse proxy before v2.11.55 lets remote unauthenticated attackers defeat any route pr
Namespace confusion in Traefik's Kubernetes Gateway API provider (versions 3.7.0-3.7.6) enables a low-privileged route a
Same weakness CWE-444 – HTTP Request/Response Smuggling
View allSame technique Authentication Bypass
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External POC / Exploit Code
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