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    CVE-2026-114642

    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 client-connection slot not keyed by ServersTransport, so one service's TLS client configuration is reused for another service's backend. An unauthenticated client can arm the slot via a backend issuing an NTLM or Negotiate challenge, then reach another service on the same keep-alive connection, bypassing its root CAs, server name, and certificate verification.

    Published:Oct 22, 2026
    Last Modified:Oct 23, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00167
    CVSS Score:8.7

    Affected Products

    Vendor
    Traefik
    Product
    Traefik

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    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-2026-114641 (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…
    CVE-2026-114637 (CVSS 7) — Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastPro…
    CVE-2026-114636 (CVSS 7) — Traefik v3.7.13 before v3.7.14 contains an access-control bypass in the Kubernetes Ingress NGINX provider, whe…

    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