Description
Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik's router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends. This vulnerability is fixed in 3.6.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| traefik | traefik | < 3.6.10 | — |
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 | 3.6.10-2.1 | openSUSE-SU-2026:10385-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260317T205859-150000.1.152.1 | SUSE-SU-2026:1042-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/traefik/traefik | <= 1.7.34 | — | GHSA-8q2w-wr49-whqj |
| Go | github.com/traefik/traefik | all versions | — | GO-2026-4679 |
| Go | github.com/traefik/traefik/v2 | <= 2.11.40 | — | GHSA-8q2w-wr49-whqj |
| Go | github.com/traefik/traefik/v2 | all versions | — | GO-2026-4679 |
| Go | github.com/traefik/traefik/v3 | < 3.6.10 | 3.6.10 | GHSA-8q2w-wr49-whqj |
Advisories 3
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:1042-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 26, 2026
- openSUSE-SU-2026:10385-1 traefik-3.6.10-2.1 on GA media SUSE / openSUSE Security Updates · Mar 18, 2026