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7.5 High

CVE-2026-29054 Traefik is an HTTP reverse proxy and load balancer

Description

Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.

Affected products and versions

Product Affected versions Fixed in
Red Hat OpenShift Dev Spaces 3.27 1776718585 earliest → < 1776718585 1776718585
traefik 3.1 3.1.3 → < 3.6.9 3.6.9
traefik 2.11 2.11.9 → < 2.11.38 2.11.38

References

Timeline

  1. Published
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