Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| traefik | traefik | < 2.10.6, >= 3.0.0-beta1, < 3.0.0-beta5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | traefik | 2.10.7-1.1 | openSUSE-SU-2024:13506-1 |
| openSUSE Tumbleweed | traefik2 | 2.11.5-1.1 | openSUSE-SU-2024:14076-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/traefik/traefik | all versions | — | GO-2023-2376 |
| Go | github.com/traefik/traefik/v2 | < 2.10.6 | 2.10.6 | GHSA-fvhj-4qfh-q2hm |
| Go | github.com/traefik/traefik/v3 | < 3.0.0-beta5 | 3.0.0-beta5 | GHSA-fvhj-4qfh-q2hm |
Advisories 2
- openSUSE-SU-2024:13506-1 traefik-2.10.7-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14076-1 traefik2-2.11.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026