Vulnerability details
CVE-2026-85594
traefik traefik
Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware
CVSS 4.0
7.0High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.0High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| traefik | traefik | 3.7.1 ≤ v ≤ 3.7.12 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-09-04
- Last updated
- 2026-10-08
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.47%
Probability of exploitation in 30 days
41.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-639Authorization Bypass Through User-Controlled Key