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
| Link | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4 | Patch |
| https://github.com/traefik/traefik/releases/tag/v3.6.3 | Release Notes |
| https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj | Patch Vendor Advisory |
Configurations
History
02 Jan 2026, 21:12
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4 - Patch | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.6.3 - Release Notes | |
| References | () https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj - Patch, Vendor Advisory | |
| First Time |
Traefik
Traefik traefik |
|
| CPE | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* |
09 Dec 2025, 01:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-12-09 01:16
Updated : 2026-01-02 21:12
NVD link : CVE-2025-66491
Mitre link : CVE-2025-66491
CVE.ORG link : CVE-2025-66491
JSON object : View
Products Affected
traefik
- traefik
CWE
CWE-295
Improper Certificate Validation