HTTP Request Smuggling Affecting github.com/traefik/traefik/v2/pkg/server/service package, versions <2.11.53
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Aug 2026
- disclosed6 Aug 2026
- creditxclow3n
Introduced: 6 Aug 2026
CVE-2026-71324 Â (opens in a new tab)How to fix?
Upgrade github.com/traefik/traefik/v2/pkg/server/service to version 2.11.53 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling through the CONNECT handling path and the shared backend transport. An attacker can make another client read attacker-smuggled backend output by sending an HTTP/2 or HTTP/3 CONNECT request with a body that Traefik forwards to an HTTP/1.1 upstream over a reused keep-alive connection. If the upstream replies to the forwarded CONNECT without draining that body, the desynchronized backend socket remains in Traefik’s idle pool and is later reused for an unrelated request, exposing one client to another client’s response and potentially private or authenticated content.