---
cve: "CVE-2026-71326"
severity: "LOW"
cvss: 2.1
epss: "36%"
vendor: "traefik"
kev: false
exploited: false
published: "2026-08-06 22:18:29"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T13:39:47+02:00"
---

# CVE-2026-71326

> 2.1 LOW · 🧪 PoC

## Beschreibung

Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 4b18b24b0b002dcc80e0640c6088a87d813de29a (Commit)
- 2a2349356c01b1b1f7ecddb0c17b30c97f5241e7 (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf>
- <https://github.com/traefik/traefik/pull/13572>
- <https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350>
- <https://github.com/traefik/traefik/releases/tag/v3.6.25>
- <https://github.com/traefik/traefik/releases/tag/v3.7.10>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71326) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_