---
cve: "CVE-2026-67309"
severity: "HIGH"
cvss: 7.8
epss: "49%"
vendor: "traefik"
kev: false
exploited: false
published: "2026-08-01 13:17:00"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T09:38:48+02:00"
---

# CVE-2026-67309

> 7.8 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 69259c3acc9d4bdc065cb2e3b83336f7de3e7038 (Commit)
- b93f02cd07b79490fb8c8f02e301a7a1ec553195 (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-8rxv-jg7p-wvg3>
- <https://github.com/traefik/traefik/commit/b93f02cd07b79490fb8c8f02e301a7a1ec553195>
- <https://github.com/traefik/traefik/commit/69259c3acc9d4bdc065cb2e3b83336f7de3e7038>
- <https://www.vulncheck.com/advisories/traefik-path-traversal-via-rewritetarget-authentication-bypass>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67309) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_