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

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。

AI Predicted 5.4 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik >= 3.7.0-rc.0, < 3.7.0-rc.3 affected
>= 3.0.0-beta1, < 3.6.14 affected
< 2.11.43 affected
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I. Basic Information for CVE-2026-41181

Vulnerability Information
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Vulnerability Title
Traefik: Errors middleware forwards Authorization and Cookie headers to separate error page service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
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 >= 3.7.0-rc.0, < 3.7.0-rc.3 -

II. Public POCs for CVE-2026-41181

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III. Intelligence Information for CVE-2026-41181

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Vendor Advisories for CVE-2026-41181 (1)

Vendor Pages for CVE-2026-41181 (3)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-201

V. Comments for CVE-2026-41181

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