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

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-27 · updated 2026-07-15
• Weakness: CWE-74

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 products

• Traefik: before 3.6.11; 3.7.0-ea1 — fixed in 3.6.11

How to fix

Upgrade to a fixed version: Traefik 3.6.11. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/releases/tag/v3.6.11
• https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
• https://github.com/traefik/traefik/security/advisories/GHSA-67jx-r9pv-98rj
• 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

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