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CVE-2026-71324— Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool

Quick assessment

Affected
traefik traefik
Exploitation
Public or AI PoC available; prioritize validation
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 2.11.53之前版本、3.6.24之前版本和3.7.9之前版本存在输入验证错误漏洞，该漏洞源于共享连接处理不当导致HTTP请求走私，可能导致未经身份验证的攻击者使其他客户端读取攻击者走私的响应，其中可能包含已认证或私有内容。

CVSS 7.0 · High EPSS 0.69% · P51

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.53 affected
>= 3.0.0, < 3.6.24 affected
>= 3.7.0, < 3.7.9 affected
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I. Basic Information for CVE-2026-71324

Vulnerability Information
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Vulnerability Title
Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT with a keep-alive non-2xx response and does not drain the body, Traefik returns the desynchronized backend socket to its shared pool and reuses it for other clients. An unauthenticated attacker can use this behavior to make a different client read the attacker's smuggled response, which can include authenticated or private content from another request. The ForwardAuth middleware with forwardBody true and preserveRequestMethod true can re-issue a CONNECT with the buffered body attached, exposing the auth-client pool to the same desynchronization. This issue is fixed in 2.11.53, 3.6.24, and 3.7.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
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公司开源的一款负载均衡器。 Traefik 2.11.53之前版本、3.6.24之前版本和3.7.9之前版本存在输入验证错误漏洞，该漏洞源于共享连接处理不当导致HTTP请求走私，可能导致未经身份验证的攻击者使其他客户端读取攻击者走私的响应，其中可能包含已认证或私有内容。
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 < 2.11.53 -

II. Public POCs for CVE-2026-71324

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8123 chars
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III. Intelligence Information for CVE-2026-71324

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Patches & Fixes for CVE-2026-71324 (6)

Vendor Advisories for CVE-2026-71324 (1)

Vendor Pages for CVE-2026-71324 (3)

Same Patch Batch · traefik · 2026-08-06 · 4 CVEs total

CVE-2026-71327 7.6 HIGH Traefik: Gateway API route identity collision allows cross-namespace backend hijacking
CVE-2026-71325 4.8 MEDIUM Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
CVE-2026-71326 2.1 LOW Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-444

V. Comments for CVE-2026-71324

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