Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField (traefik traefik)
En bref
- Source
- NVD
- EPSS
- EPSS 0.49 % · centile 42 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- GitHub_M
- Statut NVD
- Modified
Description
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.
Faiblesses (CWE)
- CWE-290 — Contournement d'authentification par usurpation
Références
- https://github.com/traefik/traefik/security/advisories/GHSA-qr99-7898-vr7c
- https://github.com/traefik/traefik/releases/tag/v2.11.42
- https://github.com/traefik/traefik/releases/tag/v3.6.11
- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3
- https://access.redhat.com/security/cve/CVE-2026-33433
- https://bugzilla.redhat.com/show_bug.cgi?id=2452289
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33433.json
- https://access.redhat.com/errata/RHSA-2026:10175
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 5.1 | 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 | GitHub_M |
| CVSS 3.1 | HIGH 7.7 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N | redhat-SADP |
| CVSS 4.0 | MEDIUM 5.1 | 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 | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 3.1 | HIGH 7.7 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Avis
- GHSA-qr99-7898-vr7c — Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField
- GO-2026-4893 — Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField in github.com/traefik/traefik
Références européennes
- ENISA EUVD · EUVD-2026-16616
- GCVE · GCVE-0-2026-33433
Avis du CERT-FR
- CERTFR-2026-AVI-0366 — Multiples vulnérabilités dans Traefik · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*< 2.11.42cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*≥ 3.0.0 < 3.6.12cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| traefik · traefik | affected < 2.11.42 ; affected >= 3.0.0-beta1, < 3.6.11 ; affected >= 3.7.0-ea.1, < 3.7.0-ea.3 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |