Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| traefik | traefik | < 2.11.43, >= 3.0.0-beta1, < 3.6.14, >= 3.7.0-ea.1, < 3.7.0-rc.2 | — |
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 | 3.6.15-1.1 | openSUSE-SU-2026:10697-1 |
| openSUSE Tumbleweed | traefik2 | 2.11.44-1.1 | openSUSE-SU-2026:10698-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/traefik/traefik | <= 1.7.34 | — | GHSA-6384-m2mw-rf54 |
| Go | github.com/traefik/traefik | all versions | — | GO-2026-5163 |
| Go | github.com/traefik/traefik/v2 | < 2.11.43 | 2.11.43 | GHSA-6384-m2mw-rf54 |
| Go | github.com/traefik/traefik/v3 | >= 3.7.0-ea.1, < 3.7.0-rc.2 | 3.7.0-rc.2 | GHSA-6384-m2mw-rf54 |
| Go | github.com/traefik/traefik/v3 | >= 3.0.0-beta1, < 3.6.14 | 3.6.14 | GHSA-6384-m2mw-rf54 |
| Go | github.com/traefik/traefik/v3 | >= 3.0.0-beta1, < 3.6.14 · >= 3.7.0-ea.1, < 3.7.0-rc.2 | 3.6.14, 3.7.0-rc.2 | GO-2026-5163 |
Advisories 3
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2026:10698-1 traefik2-2.11.44-1.1 on GA media SUSE / openSUSE Security Updates · May 6, 2026
- openSUSE-SU-2026:10697-1 traefik-3.6.15-1.1 on GA media SUSE / openSUSE Security Updates · May 6, 2026