CVE-2026-40912— Traefik: StripPrefixRegex auth bypass via Path/RawPath desync

Traefik: StripPrefixRegex auth bypass via Path/RawPath desync

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after stripping becomes a dot-segment (e.g. /./admin/secret). ForwardAuth receives this dot-segment path in X-Forwarded-Uri, which does not match the protected path patterns and therefore allows the request through. The backend then normalizes the dot-segment to the real path per RFC 3986 and serves the protected content An unauthenticated attacker can exploit this against any backend that performs dot-segment normalization. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

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Traefik 安全漏洞

Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在安全漏洞，该漏洞源于StripPrefixRegex中间件与ForwardAuth、BasicAuth或DigestAuth结合使用时，正则表达式匹配解码URL路径但使用结果字节长度切片百分编码原始路径，可能导致未经身份验证的攻击者绕过身份验证。

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