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CVE-2026-88004— Traefik entrypoint header-name sanitization bypassed via request trailers

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公司开源的一款负载均衡器。 Traefik 3.2.0版本至3.7.13之前版本存在安全漏洞，该漏洞源于入口点防御策略仅检查请求标头而未检查尾随标头，允许未经身份验证的客户端在HTTP/1.1分块尾随标头或HTTP/2尾随标头中提交别名或受信任的标头名称。当重试或缓冲中间件在反向代理克隆请求之前读取正文时，攻击者控制的尾随标头值到达后端并合并到标头命名空间，绕过删除或拒绝行为，可能导致身份欺骗或转发路由数据欺骗。

CVSS 7.0 · High EPSS 0.45% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
traefik traefik >= 3.2.0, < 3.7.13 affected
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I. Basic Information for CVE-2026-88004

Vulnerability Information
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Vulnerability Title
Traefik entrypoint header-name sanitization bypassed via request trailers
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted header name in an HTTP/1.1 chunked trailer or an HTTP/2 trailer. When the retry or buffering middleware reads the body before the reverse proxy clones the request, the attacker-controlled trailer value reaches a backend that merges trailers into the header namespace, bypassing the documented delete or reject behavior and potentially spoofing identity or forwarded routing data. This issue is fixed in 3.7.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/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
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 3.2.0版本至3.7.13之前版本存在安全漏洞，该漏洞源于入口点防御策略仅检查请求标头而未检查尾随标头，允许未经身份验证的客户端在HTTP/1.1分块尾随标头或HTTP/2尾随标头中提交别名或受信任的标头名称。当重试或缓冲中间件在反向代理克隆请求之前读取正文时，攻击者控制的尾随标头值到达后端并合并到标头命名空间，绕过删除或拒绝行为，可能导致身份欺骗或转发路由数据欺骗。
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 >= 3.2.0, < 3.7.13 -

II. Public POCs for CVE-2026-88004

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III. Intelligence Information for CVE-2026-88004

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Patches & Fixes for CVE-2026-88004 (2)

Vendor Advisories for CVE-2026-88004 (1)

Vendor Pages for CVE-2026-88004 (1)

Same Patch Batch · traefik · 2026-09-10 · 9 CVEs total

CVE-2026-88877 9.8 CRITICAL Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
CVE-2026-88007 9.1 CRITICAL Traefik HTTP/3 Backend NTLM Connection Reuse
CVE-2026-88009 8.8 HIGH Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing
CVE-2026-88008 7.0 HIGH Traefik: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVE-2026-88879 5.3 MEDIUM Traefik before v2.11.56 Identity Spoofing via Header Alias
CVE-2026-88878 5.3 MEDIUM Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass
CVE-2026-88011 5.3 MEDIUM Traefik: ForwardAuth identity spoofing via dot-form header alias
CVE-2026-88012 5.3 MEDIUM Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body upload

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-436