Disclosure summary
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.
Source-reported weakness categories
CWE-639
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-85594
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| traefik | traefik | * {"versionEndExcluding":"3.7.11"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Exploit, Patch, Vendor Advisory
- www.vulncheck.com — Third Party Advisory
PUBLISHED 2026-09-04T08:17:22-04:00
MODIFIED 2026-10-08T12:17:55-04:00
INGESTED 2026-10-10T20:50:36-04:00