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    CVE-2026-85597

    Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

    Published:Sep 4, 2026
    Last Modified:Sep 16, 2026
    EPS:Sep 4, 2026
    EPSS Score:0.0023
    CVSS Score:9.1

    Affected Products

    Vendor
    Traefik
    Product
    Traefik

    Exploits

    https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-90 Reflection Attack in Authentication Protocol

    Related CVEs

    CVE-2026-121966 (CVSS 7) — Traefik 2.x before 2.11.60 and 3.x before 3.7.16 sends ForwardAuth subrequests (and, in 3.7, Ingress NGINX aut…
    CVE-2026-119574 (CVSS 8.2) — Traefik from 3.2.0 before 3.7.15 contains a data race in the experimental FastProxy that allows unauthenticate…
    CVE-2026-119573 (CVSS 2.1) — Traefik 3.7.11 before 3.7.15 contains an authorization bypass in the Kubernetes Ingress NGINX provider that sk…
    CVE-2026-119572 (CVSS 7) — Traefik from 3.7.0-ea.1 before 3.7.15 contains an authentication bypass vulnerability in the Kubernetes Ingres…
    CVE-2026-114656 (CVSS 6.9) — Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated …
    CVE-2026-114642 (CVSS 7) — Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a clie…
    CVE-2026-114641 (CVSS 6.3) — Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate)…
    CVE-2026-114640 (CVSS 7) — Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-N…
    CVE-2026-114639 (CVSS 7) — Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first reques…
    CVE-2026-114638 (CVSS 7) — Traefik v3.7.0 before v3.7.14 contains an improper authentication vulnerability in the Kubernetes Ingress NGIN…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High