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I. Basic Information for CVE-2025-66490
Vulnerability Information

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Vulnerability Title
Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules
Source: NVD (National Vulnerability Database)
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, \, Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
解释冲突
Source: NVD (National Vulnerability Database)
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款开源的反向代理与负载均衡工具。 Traefik 2.11.31版本至3.6.2版本存在安全漏洞,该漏洞源于路径规范化绕过,可能导致请求绕过安全控制。
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
VendorProductAffected VersionsCPESubscribe
traefiktraefik github.com/traefik/traefik/v3 < 3.6.3 -
II. Public POCs for CVE-2025-66490
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III. Intelligence Information for CVE-2025-66490
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