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CVE-2026-33433— Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField

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 2.11.42之前版本、3.6.11之前版本和3.7.0-ea.3之前版本存在安全漏洞，该漏洞源于配置非规范HTTP标头名称时，可能导致经过身份验证的攻击者注入标头并冒充身份。

AI Predicted 8.1 Difficulty: Easy EPSS 0.47% · P39

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.42 affected
>= 3.0.0-beta1, < 3.6.11 affected
>= 3.7.0-ea.1, < 3.7.0-ea.3 affected
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I. Basic Information for CVE-2026-33433

Vulnerability Information
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Vulnerability Title
Traefik Vulnerable to BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.42, 3.6.11, and 3.7.0-ea.3, when `headerField` is configured with a non-canonical HTTP header name (e.g., `x-auth-user` instead of `X-Auth-User`), an authenticated attacker can inject their own canonical version of that header to impersonate any identity to the backend. The backend receives two header entries — the attacker-injected canonical one is read first, overriding Traefik's non-canonical write. Versions 2.11.42, 3.6.11, and 3.7.0-ea.3 patch the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
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 2.11.42之前版本、3.6.11之前版本和3.7.0-ea.3之前版本存在安全漏洞，该漏洞源于配置非规范HTTP标头名称时，可能导致经过身份验证的攻击者注入标头并冒充身份。
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 < 2.11.42 -

II. Public POCs for CVE-2026-33433

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III. Intelligence Information for CVE-2026-33433

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Patches & Fixes for CVE-2026-33433 (1)

Vendor Advisories for CVE-2026-33433 (1)

Vendor Pages for CVE-2026-33433 (2)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-290

V. Comments for CVE-2026-33433

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