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Vulnerabilities / CVE-2026-71324

critical

CVE-2026-71324

github.com/traefik/traefik: Traefik: Information disclosure via response poisoning in shared backend pool

Published Modified CWE 444
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GHSA7.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Red Hat8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (high), Red Hat (high).

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.

Affected packages and fixed versions

SourcePackageFixed in
go::GitHub Security Advisory Gogithub.com/traefik/traefik, github.com/traefik/traefik/v2, github.com/traefik/traefik/v32.11.53 and 1 more
minimostraefik-3, traefik-fips-33.7.9-r0
rapidfort alpine 3.20traefik3.7.9-r0
rapidfort alpine 3.21traefik3.7.9-r0
rapidfort alpine 3.22traefik3.7.9-r0
rapidfort alpine 3.23traefik3.7.9-r0
rapidfort alpine 3.24traefik3.7.9-r0
Show all 10 entries from 7 sources
SourcePackageFixed in
go::GitHub Security Advisory Gogithub.com/traefik/traefikno fix listed
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v22.11.53
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v33.6.24, 3.7.9
minimostraefik-33.7.9-r0
minimostraefik-fips-33.7.9-r0
rapidfort alpine 3.20traefik3.7.9-r0
rapidfort alpine 3.21traefik3.7.9-r0
rapidfort alpine 3.22traefik3.7.9-r0
rapidfort alpine 3.23traefik3.7.9-r0
rapidfort alpine 3.24traefik3.7.9-r0

References

All 14 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.