CVSS 4.0
6.3 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:NCVE-2026-32695
Medium (6.3) in traefik traefik. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v3 3.6.11, 3.7.0-ea.2.
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.
Severity
CVSS 3.1
7.7 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-74, CWE-917
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-67jx-r9pv-98rj | Go | github.com/traefik/traefik/v3 | <3.6.11 | 3.6.11 |
| GHSA-67jx-r9pv-98rj | Go | github.com/traefik/traefik/v3 | >=3.7.0-ea.1 <3.7.0-ea.2 | 3.7.0-ea.2 |
| GHSA-67jx-r9pv-98rj | Go | github.com/traefik/traefik/v2 | <=2.11.42 | no fix published |
| GO-2026-4880 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-4880 | Go | github.com/traefik/traefik/v2 | all versions | no fix published |
| GO-2026-4880 | Go | github.com/traefik/traefik/v3 | <3.6.11 >=3.7.0-ea.1 <3.7.0-ea.2 | 3.6.11, 3.7.0-ea.2 |