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HTTP Request Smuggling Affecting traefik-3 package, versions <3.7.9-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.55% (44th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-TRAEFIK3-18585307
  • published8 Aug 2026
  • disclosed6 Aug 2026
Report a new vulnerability Found a mistake?

Introduced: 6 Aug 2026

NewCVE-2026-71324  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade Minimos:latest traefik-3 to version 3.7.9-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream traefik-3 package and not the traefik-3 package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT with a keep-alive non-2xx response and does not drain the body, Traefik returns the desynchronized backend socket to its shared pool and reuses it for other clients. An unauthenticated attacker can use this behavior to make a different client read the attacker's smuggled response, which can include authenticated or private content from another request. The ForwardAuth middleware with forwardBody true and preserveRequestMethod true can re-issue a CONNECT with the buffered body attached, exposing the auth-client pool to the same desynchronization. This issue is fixed in 2.11.53, 3.6.24, and 3.7.9.

References