CVE-2026-88879— Traefik 2.11.56 身份仿冒漏洞
一分钟漏洞结论
影响对象
traefik traefik
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
以下是该漏洞描述的中文翻译： Traefik 是一个 HTTP 反向代理和负载均衡器。在 Traefik v1.x、v2.x 至 v2.11.55 以及 v3.0.0 至 v3.7.11 版本中，头部（Header）名称仅在连字符（dash）上进行规范化。因此， 、 和 会被 Traefik 视为三个不同的头部。然而，那些从头部名称推导变量名的后端（如 CGI、WSGI、PHP、NGINX 等）会将这些变体合并为单个变量。 因此，客户端可以绕过管理特定头部的中间件，将头部名称的“点号”形式（dot-form ali
可能的 ATT&CK 技术 3 AI
T1595 · Active Scanning T1071 · Application Layer Protocol T1012 · Query Registry
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一、 漏洞 CVE-2026-88879 基础信息
漏洞信息
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Vulnerability Title
Traefik before v2.11.56 Identity Spoofing via Header Alias
来源: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. In Traefik v1.x, v2.x through v2.11.55, and v3.0.0 through v3.7.11, header names are canonicalized only on dashes, so X-Auth-User, X_Auth_User and X.Auth.User are treated as three distinct headers by Traefik, while backends that derive variable names from header names (CGI, WSGI, PHP, NGINX and others) collapse them into a single variable. A client can therefore smuggle a dot-form alias of a header that Traefik manages past the middleware managing it — for example supplying X.Authenticated.User alongside the canonical X-Authenticated-User written by the ForwardAuth middleware — causing such a backend to read the client-supplied value instead of the identity Traefik asserted. In the tested configuration (PHP 8.2 built-in SAPI over an HTTP/1 backend path), Go's lexical header ordering makes the attacker-supplied value win deterministically, so a client that ForwardAuth admits as a low-privilege identity can be treated by the backend as a different user or role. Any header Traefik sets is affected, not only ForwardAuth's. This is an incomplete fix for GHSA-x677-9fxg-v5c5, which blocked only the underscore form. Fixed in v2.11.56 and v3.7.12, which add the aliasHeadersStrategy entry-point option; because it defaults to 'keep' for backwards compatibility, it must be explicitly set to 'delete' or 'reject' for the fix to take effect. Unmaintained release lines will not receive a patch.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-88879 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-88879 厂商安全公告 (2)
同批安全公告 · traefik · 2026-09-10 · 共 9 条
| CVE-2026-88877 | 9.8 CRITICAL | Traefik 3.7.0 认证绕过漏洞 |
| CVE-2026-88007 | 9.1 CRITICAL | Traefik HTTP/3 后端 NTLM 连接复用漏洞 |
| CVE-2026-88009 | 8.8 HIGH | Traefik 无根HTTP请求路径转发绕过漏洞 |
| CVE-2026-88004 | 7.0 HIGH | Traefik 请求头校验绕过漏洞 |
| CVE-2026-88008 | 7.0 HIGH | Traefik 请求走私及授权错误漏洞 |
| CVE-2026-88878 | 5.3 MEDIUM | Traefik 2.8.2-3.6 HTTP/3超时绕过 |
| CVE-2026-88011 | 5.3 MEDIUM | Traefik 正向认证身份伪造漏洞 |
| CVE-2026-88012 | 5.3 MEDIUM | Traefik HTTP/3 读取超时未生效导致慢速请求无限制 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-88879
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