CVE-2026-44774

Critical · CVSS 9.9

Traefik — Improper Access Control via Kubernetes Gateway API HTTPRoute backend reference bypass (CWE-284, CWE-15)

CVSS: 9.9; nvd
EPSS: 0.46%; 37th pct
KEV: No
Class: oss containerizable; CWE-284, CWE-15

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.46, 3.6.17, and 3.7.1, Traefik's Kubernetes Gateway API provider allows a tenant with HTTPRoute creation permissions to expose the REST provider handler, bypassing the providers.rest.insecure=false setting. The Gateway provider accepts any TraefikService backend reference whose name ends with @internal, making it possible to route traffic to rest@internal in addition to the intended api@internal. In shared Gateway deployments where the REST provider is enabled, this allows a low-privileged actor to gain live dynamic configuration write access to Traefik, enabling unauthorized reconfiguration of routers and services. This vulnerability is fixed in 2.11.46, 3.6.17, and 3.7.1.

Search profile — drives PoC discovery

Symbols rest@internalapi@internal@internalproviders.rest.insecureHTTPRouteTraefikServiceGateway API providerREST provider handlerproviders/restinsecure=false

Keywords CVE-2026-44774Traefik HTTPRoute rest@internal bypassTraefik REST provider insecure bypassTraefik Gateway API tenant privilege escalationTraefik TraefikService @internal bypassGHSA-96qj-4jj5-wcjcTraefik dynamic configuration unauthorized writeTraefik Kubernetes Gateway API access control bypassTraefik rest provider exposure HTTPRoute

Versions: < 2.11.46, < 3.6.17, < 3.7.1

Affected packages

Go	github.com/traefik/traefik	0 → ∞
Go	github.com/traefik/traefik/v2	0 → 2.11.46
Go	github.com/traefik/traefik/v3	0 → 3.6.17
Go	github.com/traefik/traefik/v3	3.7.0 → 3.7.1

References

Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T12:30:14.000Z