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CVE-2026-85594— Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik v3.7.1 及更高版本在 Kubernetes Ingress 提供者中未能对 服务注解（即 ）强制执行 限制。一个被排除在允许列表之外的命名空间受限租户，可以将其所属的服务关联到由运维人员（operator）拥有的中间件；若该中间件用于注入后端凭据，攻击者便可以在其控制的后端中获取这些凭据。

CVSS 7.0 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
traefik traefik 3.7.1≤ 3.7.12 affected
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I. Basic Information for CVE-2026-85594

Vulnerability Information
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Vulnerability Title
Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 3.7.1 ~ 3.7.12 -

II. Public POCs for CVE-2026-85594

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III. Intelligence Information for CVE-2026-85594

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Vendor Advisories for CVE-2026-85594 (2)

Same Patch Batch · traefik · 2026-09-04 · 4 CVEs total

CVE-2026-85595 9.3 CRITICAL Traefik before v2.11.55 Authentication Bypass via digestAuth
CVE-2026-85596 8.2 HIGH Traefik v3.7 Authentication Bypass via TLS Option Conflict
CVE-2026-85597 8.2 HIGH Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-639

V. Comments for CVE-2026-85594

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