# CERT-FR Flags Traefik Confidentiality Flaw

Published: 2026-10-21 · Severity: routine · Sectors: Technology, Infrastructure · Not tied to an actor or CVE
Canonical: https://vorant.io/reports/b9deabba-00d6-5a57-a9f8-a01e7151de81/cert-fr-flags-traefik-confidentiality-flaw
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> A vulnerability in Traefik before 3.7.16 or 2.11.60 allows data confidentiality breach and security bypass; patches available.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1356

## What to check

- Applies to: Not tied to a specific actor, malware or CVE, only to the sectors it covers, so it may be general reporting. Check the source before acting on it. Whether it concerns you is not assessed.

CERT-FR issued an advisory regarding a vulnerability affecting Traefik, a widely used reverse proxy and load balancer. The flaw impacts Traefik versions in the 3.x line prior to 3.7.16 and versions prior to 2.11.60 in the legacy branch. According to the advisory, successful exploitation could lead to a breach of data confidentiality and allow an attacker to bypass security policies enforced by Traefik.

No evidence of in-the-wild exploitation is mentioned in the advisory. CERT-FR directs administrators to the vendor's GitHub security advisory (GHSA-hrpp-p4fc-wwf8, published 21 October 2026) for patch details. Organizations running affected Traefik versions should prioritize upgrading to 3.7.16 or 2.11.60 or later, particularly given Traefik's common deployment as an ingress/edge proxy where confidentiality and policy bypass issues can have broad downstream impact on protected services.

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1356

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