Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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Traefik公司开源的一款负载均衡器。 Traefik 2.11.0版本至2.11.57之前版本和3.0.0版本至3.7.13之前版本存在授权问题漏洞，该漏洞源于HTTP/3入口点ConnContext未调用service.AddTransportOnContext，导致使用共享后端传输，在后端使用连接绑定的NTLM或Negotiate认证并启用keep-alive时，攻击者可重用受害者的已认证后端连接，读取受害者数据并冒充受害者。

CVSS 9.1 · Critical EPSS 0.60% · P48

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik >= 2.11.0, < 2.11.57 affected
>= 3.0.0, < 3.7.13 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-88007

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
Vulnerability Title
Traefik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 2.11.0版本至2.11.57之前版本和3.0.0版本至3.7.13之前版本存在授权问题漏洞，该漏洞源于HTTP/3入口点ConnContext未调用service.AddTransportOnContext，导致使用共享后端传输，在后端使用连接绑定的NTLM或Negotiate认证并启用keep-alive时，攻击者可重用受害者的已认证后端连接，读取受害者数据并冒充受害者。
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 >= 2.11.0, < 2.11.57 -

II. Public POCs for CVE-2026-88007

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-88007

请登录查看更多情报信息。

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