CVE-2026-32695
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/traefik/traefik/v3 | < 3.6.11 | 3.6.11 |
| go | github.com/traefik/traefik/v2 | <= 2.11.42 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Traefik | Traefik | before 3.6.11 Version 3.7.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-67jx-r9pv-98rj
- https://github.com/traefik/traefik/security/advisories/GHSA-67jx-r9pv-98rj
- https://nvd.nist.gov/vuln/detail/CVE-2026-32695
- https://github.com/traefik/traefik/commit/11d251415a6fd935025df5a9dda898e17e3097b2
- https://github.com/traefik/traefik/releases/tag/v3.6.11
- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
- https://access.redhat.com/errata/RHSA-2026:10175
- https://access.redhat.com/security/cve/CVE-2026-32695
- https://bugzilla.redhat.com/show_bug.cgi?id=2452235
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32695.json