Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols, Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit, access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and 3.7.13.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13,
    Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and
    HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols,
    Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit,
    access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through
    an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and
    3.7.13. (CVE-2026-88008)

ID	Name	Product	Family	Type	Severity
465152	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Cloud Security	Echo Local Security Checks	Local	high
465152	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
447919	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-w4v4-9rw7-5326)	Tenable Cloud Security	SCA Checks	Local	high
447919	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-w4v4-9rw7-5326)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-88008

high

Tenable Plugins

high

high

high

high