---
cve: "CVE-2026-88009"
severity: "HIGH"
cvss: 8.8
epss: "0.3%"
vendor: "traefik"
kev: false
exploited: false
published: "2026-09-10 15:01:56"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T20:14:06+02:00"
---

# CVE-2026-88009

> 8.8 HIGH · 🧪 PoC

## Beschreibung

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- 839eb7f48a16849f22762b7e3bdfc58253146cd7 (Commit)
- fc92cc118a0557a029c7019d5ee06665127b0f13 (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724>
- <https://github.com/traefik/traefik/pull/13796>
- <https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9>
- <https://github.com/traefik/traefik/releases/tag/v2.11.57>
- <https://github.com/traefik/traefik/releases/tag/v3.7.13>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-88009) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_