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CVE-2026-88008Traefik: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') and Incorrect Authorization

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols, Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit, access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and 3.7.13.

7.0 HIGHEPSS 0.48%Not in KEVNVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
7.0HIGH4.0GitHub_M (CNA)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
9.1CRITICAL3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CVE ID
CVE-2026-88008
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
Sep 10, 2026
Last modified
2026-09-14 19:59 UTC
Weaknesses
  • CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
  • CWE-863 · Incorrect Authorization

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 10:17 UTC.