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Vulnerabilities / CVE-2026-88008

critical

CVE-2026-88008

github.com/traefik/traefik: Traefik: Incorrect authorization due to HTTP/2 protocol confusion

Published Modified CWE 444, 863
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 Hat9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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

Description

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.

Affected packages and fixed versions

SourcePackageFixed in
alpine edgetraefik3.7.13-r0
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v2, github.com/traefik/traefik/v32.11.57 and 1 more
minimostraefik-3, traefik-fips-33.7.13-r0
rapidfort alpine 3.20traefik3.7.13-r0
rapidfort alpine 3.21traefik3.7.13-r0
rapidfort alpine 3.22traefik3.7.13-r0
rapidfort alpine 3.23traefik3.7.13-r0
rapidfort alpine 3.24traefik3.7.13-r0
Show all 10 entries from 8 sources
SourcePackageFixed in
alpine edgetraefik3.7.13-r0
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v22.11.57
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v33.7.13
minimostraefik-33.7.13-r0
minimostraefik-fips-33.7.13-r0
rapidfort alpine 3.20traefik3.7.13-r0
rapidfort alpine 3.21traefik3.7.13-r0
rapidfort alpine 3.22traefik3.7.13-r0
rapidfort alpine 3.23traefik3.7.13-r0
rapidfort alpine 3.24traefik3.7.13-r0

References

All 9 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.