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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是Traefik公司开源的一款负载均衡器。 Traefik 3.7.1版本至3.7.12版本存在授权问题漏洞，该漏洞源于Kubernetes Ingress provider未对traefik.ingress.kubernetes.io/service.middlewares Service注释强制执行crossProviderNamespaces限制，可能导致命名空间受限的租户附加操作员拥有的中间件并恢复后端凭据。

CVSS 7.0 · High EPSS 0.48% · P41

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
Vulnerability Title
Traefik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 3.7.1版本至3.7.12版本存在授权问题漏洞，该漏洞源于Kubernetes Ingress provider未对traefik.ingress.kubernetes.io/service.middlewares Service注释强制执行crossProviderNamespaces限制，可能导致命名空间受限的租户附加操作员拥有的中间件并恢复后端凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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 and v3.0.0 through v3.7.10 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 and v3.0.0 through v3.7.10 mTLS Bypass via TLS Option Conflict

IV. Related Vulnerabilities

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