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Multiples vulnérabilités dans Traefik (CERTFR-2026-AVI-0490)

Favicon for www.cert.ssi.gouv.fr CERT-FR Security Advisories
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Summary

CERT-FR published advisory CERTFR-2026-AVI-0490 on 24 April 2026 disclosing five CVEs (CVE-2026-35051, CVE-2026-39858, CVE-2026-40912, CVE-2026-41174, CVE-2026-41263) affecting Traefik reverse proxy software. Affected versions include Traefik prior to v2.11.43, v3.6.x prior to v3.6.14, and v3.7.0-rc.x prior to v3.7.0-rc.2. The vulnerabilities expose systems to data confidentiality breaches and security policy bypass. Organizations should obtain patches from the vendor security bulletins referenced in the advisory.

“De multiples vulnérabilités ont été découvertes dans Traefik. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et un contournement de la politique de sécurité.”

— CERT-FR , verbatim from source
Why this matters

Organizations operating Traefik as a reverse proxy, API gateway, or load balancer should verify their deployed version against the affected version matrix. Priority patching should target internet-facing Traefik instances, particularly those handling authentication, routing decisions, or middleware chains where a security policy bypass would have the greatest operational impact. The five CVEs affect different Traefik branches simultaneously, so unified patch management across v2 and v3 deployments may require coordinated release testing.

AI-drafted from the source document, validated against GovPing's analyst note standards . For the primary regulatory language, read the source document .
Published by CERT-FR on cert.ssi.gouv.fr . Detected, standardized, and enriched by GovPing. Review our methodology and editorial standards .

About this source

CERT-FR is the French government's national cybersecurity incident response team, run by the ANSSI. Their advisory feed publishes vulnerability disclosures, active exploitation warnings, and emergency patching guidance for software in widespread enterprise use: browsers, hypervisors, ERP systems, network equipment, file transfer products. Around 180 advisories a month. The advisories are written in French but cover the same vulnerability universe as CISA, NCSC-UK, BSI's CERT-Bund, and JPCERT, often hours earlier on European-headquartered vendors. Watch this if you patch enterprise software, run a SOC, write detection content, or track Schneider, Dassault, OVH, Atos, or any French-vendor advisory faster than English-language sources will surface it. GovPing publishes each advisory with the affected vendor, severity, and CERT-FR link.

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What changed

CERT-FR issued a security advisory disclosing multiple vulnerabilities in Traefik reverse proxy software. Five CVEs were identified affecting three version branches: Traefik prior to v2.11.43, v3.6.x prior to v3.6.14, and v3.7.0-rc.x prior to v3.7.0-rc.2. The vulnerabilities enable attackers to compromise data confidentiality and bypass security policies.

Organizations running Traefik instances should immediately identify whether their deployments fall within the affected version ranges and apply the patches referenced in the vendor security bulletins (GHSA-5m6w-wvh7-57vm, GHSA-6384-m2mw-rf54, GHSA-6jwx-7vp4-9847, GHSA-6x2q-h3cr-8j2h, GHSA-xhjw-95fp-8vgq) on GitHub. Failure to patch exposes systems to unauthorized data access and potential security control circumvention.

Archived snapshot

Apr 24, 2026

GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.

Premier Ministre S.G.D.S.N

Agence nationale
de la sécurité des
systèmes d'information

Paris, le 24 avril 2026 N° CERTFR-2026-AVI-0490 Affaire suivie par: CERT-FR

Avis du CERT-FR

Objet: Multiples vulnérabilités dans Traefik

Gestion du document

| Référence | CERTFR-2026-AVI-0490 |
| Titre | Multiples vulnérabilités dans Traefik |
| Date de la première version | 24 avril 2026 |
| Date de la dernière version | 24 avril 2026 |
| Source(s) | Bulletin de sécurité Traefik GHSA-5m6w-wvh7-57vm du 24 avril 2026
Bulletin de sécurité Traefik GHSA-6384-m2mw-rf54 du 24 avril 2026
Bulletin de sécurité Traefik GHSA-6jwx-7vp4-9847 du 24 avril 2026
Bulletin de sécurité Traefik GHSA-6x2q-h3cr-8j2h du 24 avril 2026
Bulletin de sécurité Traefik GHSA-xhjw-95fp-8vgq du 24 avril 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.

Risques

  • Atteinte à la confidentialité des données
  • Contournement de la politique de sécurité

Systèmes affectés

  • Traefik versions antérieures à v2.11.43
  • Traefik versions v3.6.x antérieures à v3.6.14
  • Traefik versions v3.7.0-rc.x antérieures à v3.7.0-rc.2

Résumé

De multiples vulnérabilités ont été découvertes dans Traefik. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et un contournement de la politique de sécurité.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Documentation

Gestion détaillée du document

  1. le 24 avril 2026 Version initiale

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Source

Favicon for www.cert.ssi.gouv.fr
CERT-FR Security Advisories cert.ssi.gouv.fr/avis
Data Privacy & Cybersecurity

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Classification

Agency
CERT-FR
Published
April 24th, 2026
Instrument
Guidance
Branch
Executive
Source language
fr
Legal weight
Non-binding
Stage
Final
Change scope
Substantive

Who this affects

Applies to
Technology companies Government agencies
Industry sector
5112 Software & Technology
Activity scope
Vulnerability disclosure Security advisory Patch management
Geographic scope
France FR

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Data Privacy Software & Technology

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