EUVD-2026-16616
GHSA-qr99-7898-vr7c
CVSS VectorNVD
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Traefik reverse proxy and load balancer versions prior to 2.11.42, 3.6.11, and 3.7.0-ea.3 allow authenticated attackers to inject canonical HTTP header names that override non-canonical headers configured via the headerField setting, enabling identity impersonation to backend systems. The vulnerability exploits HTTP header handling inconsistencies where backends read the attacker-supplied canonical header before Traefik's non-canonical configuration, permitting authentication bypass for any identity. …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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