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CVE-2026-85594

9.8 CRITICALPublic exploitEPSS 0.21%
  1. Published4 Sept 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Traefik Traefik< 3.7.11

Remediation

Fixed in
Traefik Traefik≥ 3.7.11

References

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Frequently asked

Is CVE-2026-85594 being actively exploited?

CVE-2026-85594 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.21%.

How severe is CVE-2026-85594?

CVE-2026-85594 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.21% probability of exploitation.

Which products are affected by CVE-2026-85594?

Affected products include Traefik Traefik.

How do I fix CVE-2026-85594?

Upgrade affected software to a fixed version, for example Traefik Traefik 3.7.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-85594 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.