{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-66491",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2025-12-02T22:44:04.707Z",
        "datePublished": "2025-12-09T00:38:39.208Z",
        "dateUpdated": "2025-12-09T16:03:28.511Z"
    },
    "containers": {
        "cna": {
            "title": "Traefik has Inverted TLS Verification Logic in its ingress-nginx Provider",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-295",
                            "lang": "en",
                            "description": "CWE-295: Improper Certificate Validation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj"
                },
                {
                    "name": "https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4"
                },
                {
                    "name": "https://github.com/traefik/traefik/releases/tag/v3.6.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/releases/tag/v3.6.3"
                }
            ],
            "affected": [
                {
                    "vendor": "traefik",
                    "product": "traefik",
                    "versions": [
                        {
                            "version": ">= 3.5.0, < 3.6.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2025-12-09T00:38:39.208Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-7vww-mvcr-x6vj",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2025-12-09T14:17:29.439457Z",
                                "id": "CVE-2025-66491",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2025-12-09T16:03:28.511Z"
                }
            }
        ]
    }
}