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CVE-2026-33433

CVE-2026-33433 · Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.42, 3.6.11, and 3.7.0-ea.3, when `headerField` is configured with a non-canonical HTTP header name (e.g., `x-auth-user` instead of `X-Auth-User`), an authenticated attacker can inject their own canonical version of that header to impersonate any identity to the backend. The backend receives two header entries — the attacker-injected canonical one is read first, overriding Traefik's non-canonical write. Versions 2.11.42, 3.6.11, and 3.7.0-ea.3 patch the issue.

CVSS 5.1 · Moyenne · EPSS 0,5%

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Pile logicielle: web

Produits et versions concernés

  • traefik

    Versions du logiciel
    • < 2.11.42: Concernée
    • >= 3.0.0-beta1, < 3.6.11: Concernée
    • >= 3.7.0-ea.1, < 3.7.0-ea.3: Concernée

    Aucun correctif publié

Sources originales

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