CVE-2026-41181— Traefik: Errors middleware forwards Authorization and Cookie headers to separate error page service

Traefik: Errors middleware forwards Authorization and Cookie headers to separate error page service

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.

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通过发送数据的信息暴露

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 2.11.44之前版本、3.6.15之前版本和3.7.0-rc.3之前版本存在安全漏洞，该漏洞源于errors中间件在后端返回匹配配置状态范围的响应时，将原始请求的完整标头集（包括Authorization、Cookie和其他认证材料）转发到错误页面服务，可能导致敏感凭据泄露。

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