CVE-2026-32695 Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
Traefik's Knative provider allows rule injection via unescaped host values, enabling host restriction bypass and cross-tenant traffic exposure in multi-tenant clusters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32695?
CVE-2026-32695 is a medium-severity code injection vulnerability in Traefik Traefik, published on 27 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-32695?
9 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v3 Go | All versions | 3.6.11, 3.7.0-ea.2 |
github.com/traefik/traefik/v3 Go | All versions | 3.6.11 |
github.com/traefik/traefik/v3 Go | All versions | 3.6.11 |
github.com/traefik/traefik/v3 Go | From 3.7.0-ea.1 | 3.7.0-ea.2 |
github.com/traefik/traefik/v3 Go | From 3.7.0-ea.1 | 3.7.0-ea.2 |
github.com/traefik/traefik Go | All versions | None |
3 more packages
github.com/traefik/traefik/v2 Go | All versions | None |
github.com/traefik/traefik/v2 Go | All versions to 2.11.42 | None |
github.com/traefik/traefik/v2 Go | All versions to 2.11.42 | None |
Products include Traefik Traefik.
How do I fix CVE-2026-32695?
Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.6.11 or 3.7.0-ea.2.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-32695 being exploited?
There is no known exploitation of CVE-2026-32695 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as ECHO-8b5a-8e18-7ee1, GHSA-67jx-r9pv-98rj, GO-2026-4880, MINI-439x-vfxf-9hpw, MINI-5jj8-r99g-fhwr, MINI-qf35-mgf8-5m2q.