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CVE-2026-88007— Traefik HTTP/3 Backend NTLM Connection Reuse

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 是一个开源的 HTTP 反向代理和负载均衡器。在版本 2.11.0 至 2.11.57 以及 3.7.13 之前，HTTP/3 入口点的 没有调用 ，导致 使用共享的后端传输层，而不是为每个前端连接分配专属的传输层。当启用 HTTP/3、后端使用基于连接的 NTLM 或 Negotiate 身份验证，且启用了后端 Keep-Alive 时，一个无关的客户端可以复用已为受害者认证的后端连接，从而读取仅对受害者可见的数据，并冒充该受害者行事，而无需使用受害者的凭证。此问题已在版本 2.11.57 和 3

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing
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I. Basic Information for CVE-2026-88007

Vulnerability Information
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Vulnerability Title
Traefik HTTP/3 Backend NTLM Connection Reuse
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3 enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik >= 2.11.0, < 2.11.57 -

II. Public POCs for CVE-2026-88007

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III. Intelligence Information for CVE-2026-88007

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Patches & Fixes for CVE-2026-88007 (2)

Vendor Advisories for CVE-2026-88007 (1)

Vendor Pages for CVE-2026-88007 (2)

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-2026-88009 8.8 HIGH Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing
CVE-2026-88004 7.0 HIGH Traefik entrypoint header-name sanitization bypassed via request trailers
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-287

V. Comments for CVE-2026-88007

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