Improper Certificate Validation Affecting github.com/traefik/traefik/pkg/provider/kubernetes/ingress-nginx package, versions <3.6.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published10 Dec 2025
- disclosed8 Dec 2025
- creditpavelkohout396
Introduced: 8 Dec 2025
CVE-2025-66491 Â (opens in a new tab)How to fix?
Upgrade github.com/traefik/traefik/pkg/provider/kubernetes/ingress-nginx to version 3.6.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation due to inverted logic in the InsecureSkipVerify field when processing the nginx.ingress.kubernetes.io/proxy-ssl-verify annotation. An attacker can intercept and read sensitive data by performing man-in-the-middle attacks against HTTPS backends when verification is disabled.