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CVE-2026-65602— Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

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公司开源的一款反向代理与负载均衡工具。 Traefik 3.6.0版本至3.6.22版本和3.7.0版本至3.7.6版本存在授权问题漏洞，该漏洞源于未能强制执行IngressRouteTCP service serversTransport引用的crossProviderNamespaces白名单，可能导致低权限Kubernetes用户设置serversTransport引用，从而允许使用文件提供的TCPServersTransport，包括特权的后端mTLS客户端证书、SP

CVSS 5.3 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 4

VendorProduct Version RangeStatus
traefik traefik 3.6.0< 3.6.23 affected
3.6.23 unaffected
3.7.0< 3.7.7 affected
3.7.7 unaffected
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I. Basic Information for CVE-2026-65602

Vulnerability Information
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Vulnerability Title
Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references). A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. This is fixed in 3.6.23 and 3.7.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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公司开源的一款反向代理与负载均衡工具。 Traefik 3.6.0版本至3.6.22版本和3.7.0版本至3.7.6版本存在授权问题漏洞，该漏洞源于未能强制执行IngressRouteTCP service serversTransport引用的crossProviderNamespaces白名单，可能导致低权限Kubernetes用户设置serversTransport引用，从而允许使用文件提供的TCPServersTransport，包括特权的后端mTLS客户端证书、SP
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 3.6.0 ~ 3.6.23 -
traefik traefik 3.7.0 ~ 3.7.7 -

II. Public POCs for CVE-2026-65602

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III. Intelligence Information for CVE-2026-65602

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Patches & Fixes for CVE-2026-65602 (1)

Vendor Advisories for CVE-2026-65602 (2)

Same Patch Batch · traefik · 2026-07-22 · 3 CVEs total

CVE-2026-65600 7.8 HIGH Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex
CVE-2026-65601 5.3 MEDIUM Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-863

V. Comments for CVE-2026-65602

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