# CERT-FR warns of Traefik vulnerabilities

Published: 2026-11-12 · Severity: routine · Sectors: Technology · Not tied to an actor or CVE
Canonical: https://vorant.io/reports/916bf83b-7670-50dd-ae23-b8e9dd5d931c/cert-fr-warns-of-traefik-vulnerabilities
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> CERT-FR advises multiple vulnerabilities in Traefik reverse proxy allow remote DoS, data integrity and confidentiality compromise; patches available.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1517

## 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 detailing multiple vulnerabilities discovered in Traefik, a widely used reverse proxy and load balancer. The flaws affect Traefik for Composer and Go version v3.8.0-rc.1 prior to v3.8.0-rc.2, Traefik 3.7.x prior to 3.7.18, and versions prior to v2.11.62. Successful exploitation could allow an attacker to cause a remote denial of service, compromise data confidentiality, or affect data integrity, as well as bypass security policies depending on the specific vulnerability exploited.

The advisory references three GitHub Security Advisories published by Traefik on November 12, 2026 (GHSA-ccgh-9g52-6vwg, GHSA-p956-6gvv-mxqp, GHSA-x5pf-cqh3-2gv8) for technical details and patch information. No evidence of active exploitation in the wild is mentioned in this bulletin. Organizations running affected Traefik versions should consult the referenced vendor advisories and upgrade to the patched releases (v3.8.0-rc.2, 3.7.18, or v2.11.62 and later as applicable) to remediate the identified risks.

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1517

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