Improper Certificate Validation Affecting traefik-2 package, versions *
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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Test your applications- Snyk IDSNYK-MINIMOSLATEST-TRAEFIK2-17216083
- published6 Jun 2026
- disclosed9 Dec 2025
Introduced: 9 Dec 2025
CVE-2025-66491 (opens in a new tab)How to fix?
There is no fixed version for Minimos:latest traefik-2.
NVD Description
Note: Versions mentioned in the description apply only to the upstream traefik-2 package and not the traefik-2 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2025-66491
- https://github.com/advisories/GHSA-7vww-mvcr-x6vj
- https://osv.dev/vulnerability/MINI-2gpr-f46c-76fm
- https://osv.dev/vulnerability/CVE-2025-66491
- https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4
- https://github.com/traefik/traefik/releases/tag/v3.6.3
- https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj