CVE-2023-47106

Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-20

• https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1Not Applicable
• https://github.com/traefik/traefik/releases/tag/v2.10.6Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-fvhj-4qfh-q2hmExploit, Third Party Advisory
• https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1Not Applicable
• https://github.com/traefik/traefik/releases/tag/v2.10.6Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-fvhj-4qfh-q2hmExploit, Third Party Advisory

Published

Dec 4, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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