CVE-2026-85596 — CVE & Security Advisory Radar

🎯 CVE-2026-85596 🧪 PoC 🇪🇺 EUVD

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CVE-2026-85596 | Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treat

Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treats this as a TLS options conflict and falls back to the entry point's default TLS configuration, which does not request a client certificate, so a route configured with nginx.ingress.kubernetes.io/auth-tls-verify-client: "on" becomes reachable without a client certificate. Only the v3.7 line is affected; the issue is fixed in v3.7.11.

Klassifikation & Betroffenheit:

traefik traefik 3.7.0 ≤3.7.10traefik traefik *

Improper Authentication 🎯 High

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

🛡️ Empfohlene Mitigation: Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-22 · Exploiting Trust in Client (High) CAPEC-57 · Utilizing REST's Trust in the System Res… (Very High) CAPEC-114 · Authentication Abuse (Medium) CAPEC-115 · Authentication Bypass (Medium) CAPEC-151 · Identity Spoofing (Medium) CAPEC-194 · Fake the Source of Data (Medium) CAPEC-593 · Session Hijacking (Very High) CAPEC-633 · Token Impersonation (Medium)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1040 · Network Sniffing T1548 · Abuse Elevation Control Mechanism T1185 · Browser Session Hijacking T1550.001 · Use Alternate Authentication Mater… T1563 · Remote Service Session Hijacking T1134 · Access Token Manipulation

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-88877 9.3 CVE-2026-85595 9.3 CVE-2026-88007 9.1 CVE-2026-88009 8.8 CVE-2025-32431 8.8

📰 Eigene Berichterstattung: ➔ CVE-2026-85596 | Traefik Labs up to 3.7.10 Kubernetes Ingress NGINX Provider imp

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 09/2026

Heute 17.09.

CVSS-Vektor-Analyse: 8.2

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

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

Veröffentlicht:04.09.2026

Aktualisiert:16.09.2026 20:42

Assigner (CNA):VulnCheck

EUVD-ID:EUVD-2026-71019

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-287: Improper Authentication ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	2026-08-29	2026-09-17
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

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