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CVE-2026-88012— Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded

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 是一款开源的 HTTP 反向代理和负载均衡器。在 2.8.2 至 2.11.55（含）以及 3.7.12 之前的版本中，HTTP/3 入口点未应用 设置，因为该超时机制作用于 TCP 连接层，而 HTTP/3 服务器在 QUIC 流层面没有对应的截止期限。未经身份验证的客户端可以通过缓慢发送请求体、持续不断地“涓滴”式传输数据，同时保持请求和到上游的连接处于打开状态，从而耗尽具有有限连接池的后端服务。该问题已在版本 2.11.56 和 3.7.12 中修复。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1559.004
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I. Basic Information for CVE-2026-88012

Vulnerability Information
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Vulnerability Title
Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik >= 2.8.2, < 2.11.56 -

II. Public POCs for CVE-2026-88012

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III. Intelligence Information for CVE-2026-88012

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Patches & Fixes for CVE-2026-88012 (2)

Vendor Advisories for CVE-2026-88012 (1)

Other References for CVE-2026-88012 (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-2026-88007 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-2026-88004 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

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-770

V. Comments for CVE-2026-88012

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