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CVE-2026-54763— Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth

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公司开源的一款反向代理与负载均衡工具。 Traefik存在安全漏洞，该漏洞源于BasicAuth、DigestAuth和ForwardAuth中间件未处理下划线变体标头名称，可能导致攻击者注入下划线变体标头，绕过身份验证或授权环境。以下版本受到影响：2.11.51之前版本、3.0.0-beta1至3.6.22之前版本和3.7.0-ea.1至3.7.6之前版本。

AI Predicted 7.5 Difficulty: Easy EPSS 0.24% · P14

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.51 affected
>= 3.0.0-beta1, < 3.6.22 affected
>= 3.7.0-ea.1, < 3.7.6 affected
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I. Basic Information for CVE-2026-54763

Vulnerability Information
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Vulnerability Title
Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
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:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik存在安全漏洞，该漏洞源于BasicAuth、DigestAuth和ForwardAuth中间件未处理下划线变体标头名称，可能导致攻击者注入下划线变体标头，绕过身份验证或授权环境。以下版本受到影响：2.11.51之前版本、3.0.0-beta1至3.6.22之前版本和3.7.0-ea.1至3.7.6之前版本。
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 < 2.11.51 -

II. Public POCs for CVE-2026-54763

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III. Intelligence Information for CVE-2026-54763

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Patches & Fixes for CVE-2026-54763 (1)

Vendor Advisories for CVE-2026-54763 (1)

Same Patch Batch · traefik · 2026-07-06 · 3 CVEs total

CVE-2026-54764 ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto whe
CVE-2026-54765 Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes shari

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-178

V. Comments for CVE-2026-54763

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