CVE-2026-67309
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication bypass. The issue is fixed in v3.7.8.
- CVSS 4.0
- 7.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N - CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-25)
- CWE
- CWE-22
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8rxv-jg7p-wvg3 | Go | github.com/traefik/traefik/v3 | >=3.7.0 <3.7.8 | 3.7.8 |
| GO-2026-6207 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-6207 | Go | github.com/traefik/traefik/v2 | all versions | no fix published |
| GO-2026-6207 | Go | github.com/traefik/traefik/v3 | >=3.7.0 <3.7.8 | 3.7.8 |
References
- https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038
- https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195
- https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3
- https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass