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Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M

CVE-2026-32695Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass

High 7.7

In plain English

A high-severity injection in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.5%top 59.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGO-2026-4880
Gogithub.com/traefik/traefik/v2no fix listedGHSA-67jx-r9pv-98rj
Gogithub.com/traefik/traefik/v2no fix listedGO-2026-4880
Gogithub.com/traefik/traefik/v33.6.11GHSA-67jx-r9pv-98rj
Gogithub.com/traefik/traefik/v33.7.0-ea.2GHSA-67jx-r9pv-98rj
Gogithub.com/traefik/traefik/v33.6.11, 3.7.0-ea.2GO-2026-4880

Affected products (as reported)

VendorProductVersions
traefik traefik < 3.6.11>= 3.7.0-ea.1, < 3.7.0-ea.2

Weakness: CWE-74, CWE-917 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References