CVE-2025-66491
CVE-2025-66491 · Traefik has Inverted TLS Verification Logic in its ingress-nginx Provider
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Traefik is an HTTP reverse proxy and load balancer. Versions 3.5.0 through 3.6.2 have inverted TLS verification logic in the nginx.ingress.kubernetes.io/proxy-ssl-verify annotation. Setting the annotation to "on" (intending to enable backend TLS certificate verification) actually disables verification, allowing man-in-the-middle attacks against HTTPS backends when operators believe they are protected. This issue is fixed in version 3.6.3.
CVSS 5.9 · Medium · EPSS 0.2%
- Published
- Updated
Stack: web
Affected products and versions
traefik
- Versions
- >= 3.5.0, < 3.6.3: Affected
No fix published