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Vulnerabilities / CVE-2026-54763

critical

CVE-2026-54763

traefik: Traefik: Identity spoofing via improper header handling in authentication middlewares

Published Modified CWE 178, 290, 345
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
GHSA7.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Red Hat10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

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

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

Affected packages and fixed versions

SourcePackageFixed in
alpine edgetraefik3.7.7-r0
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v2, github.com/traefik/traefik/v32.11.51 and 1 more
minimostraefik-3, traefik-fips-33.7.6-r0
rapidfort alpine 3.20traefik3.7.7-r0
rapidfort alpine 3.21traefik3.7.7-r0
rapidfort alpine 3.22traefik3.7.7-r0
rapidfort alpine 3.23traefik3.7.7-r0
rapidfort alpine 3.24traefik3.7.7-r0
Show all 10 entries from 8 sources
SourcePackageFixed in
alpine edgetraefik3.7.7-r0
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v22.11.51
go::GitHub Security Advisory Gogithub.com/traefik/traefik/v33.6.22, 3.7.6
minimostraefik-33.7.6-r0
minimostraefik-fips-33.7.6-r0
rapidfort alpine 3.20traefik3.7.7-r0
rapidfort alpine 3.21traefik3.7.7-r0
rapidfort alpine 3.22traefik3.7.7-r0
rapidfort alpine 3.23traefik3.7.7-r0
rapidfort alpine 3.24traefik3.7.7-r0

References

All 10 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.