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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-71324 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
CVSS-B 7.0 HIGH
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/traefik/traefik/commit/04d36f28e4eae7535e96a6351dd9f7bfb48a30e7 GitHub, Inc.
https://github.com/traefik/traefik/commit/0807b6d5dd1da8b2f7f4076ea2392b5437bf2ab0 GitHub, Inc.
https://github.com/traefik/traefik/commit/94a7508817d180f0ab2f1eae93df48d4ab19ecce GitHub, Inc.
https://github.com/traefik/traefik/pull/13542 GitHub, Inc.
https://github.com/traefik/traefik/pull/13543 GitHub, Inc.
https://github.com/traefik/traefik/pull/13556 GitHub, Inc.
https://github.com/traefik/traefik/releases/tag/v2.11.53 GitHub, Inc.
https://github.com/traefik/traefik/releases/tag/v3.6.24 GitHub, Inc.
https://github.com/traefik/traefik/releases/tag/v3.7.9 GitHub, Inc.
https://github.com/traefik/traefik/security/advisories/GHSA-3ccp-42pg-hgv6 GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') GitHub, Inc.  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-71324
NVD Published Date:
08/06/2026
NVD Last Modified:
08/07/2026
Source:
GitHub, Inc.