Improper Handling of Case Sensitivity Affecting traefik-2 package, versions <2.11.38-r0
Threat Intelligence
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-TRAEFIK2-15427093
- published6 Mar 2026
- disclosed5 Mar 2026
Introduced: 5 Mar 2026
CVE-2026-29054 (opens in a new tab)How to fix?
Upgrade Minimos:latest traefik-2 to version 2.11.38-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream traefik-2 package and not the traefik-2 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-29054
- https://github.com/advisories/GHSA-92mv-8f8w-wq52
- https://osv.dev/vulnerability/MINI-5h9q-fmqj-99q7
- https://osv.dev/vulnerability/CVE-2026-29054
- https://github.com/traefik/traefik/releases/tag/v2.11.38
- https://github.com/traefik/traefik/releases/tag/v3.6.9
- https://github.com/traefik/traefik/security/advisories/GHSA-92mv-8f8w-wq52