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Vulnerabilities / CVE-2026-85594

critical

CVE-2026-85594

github.com/traefik/traefik: Traefik: Information disclosure via crossProviderNamespaces bypass in Kubernetes Ingress provider

Published Modified CWE 639
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high).

Description

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.

Affected packages and fixed versions

SourcePackageFixed in
minimostraefik-3, traefik-fips-33.7.11-r0
rapidfort alpine 3.20traefik3.7.11-r0
rapidfort alpine 3.21traefik3.7.11-r0
rapidfort alpine 3.22traefik3.7.11-r0
rapidfort alpine 3.23traefik3.7.11-r0
rapidfort alpine 3.24traefik3.7.11-r0
Show all 7 entries from 6 sources
SourcePackageFixed in
minimostraefik-33.7.11-r0
minimostraefik-fips-33.7.11-r0
rapidfort alpine 3.20traefik3.7.11-r0
rapidfort alpine 3.21traefik3.7.11-r0
rapidfort alpine 3.22traefik3.7.11-r0
rapidfort alpine 3.23traefik3.7.11-r0
rapidfort alpine 3.24traefik3.7.11-r0

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.