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CVE-2026-33433 PUBLISHED CVSS 5.099999904632568 MEDIUM

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative `rules[].hosts[]` was exploitable for host restriction bypass (for example `tenant.example.com`) || Host(`attacker.com`), producing a router that serves attacker-controlled hosts. Knative `headers[].exact` also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant traffic exposure. Versions 3.6.11 and 3.7.0-ea.2 patch the issue.

Risk Scores

CVSS v4.0
5.099999904632568
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Affected Products

VendorProductVersions
traefiktraefik>= 3.7.0-ea.1, < 3.7.0-ea.2, >= 3.0.0-beta1, < 3.6.11, >= 3.7.0-ea.1, < 3.7.0-ea.3
github.comtraefik/traefik/v20, 0, 0
github.comtraefik/traefik/v33.7.0-ea.1, 3.0.0-beta1, 3.7.0-ea.1

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