---
cve: "CVE-2026-88007"
severity: "CRITICAL"
cvss: 9.1
epss: "33%"
vendor: "traefik"
kev: false
exploited: false
published: "2026-09-10 15:17:56"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T20:46:17+02:00"
---

# CVE-2026-88007

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3 enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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)

- d87731461f0c7beb6fdbcc5a5655a44ce56e537a (Commit)
- e8f398ee30ca5643158ea9094b701b8eae9849e5 (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv>
- <https://github.com/traefik/traefik/pull/13812>
- <https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c>
- <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-2026-88007) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_