{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-71326",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-05T18:14:42.065Z",
        "datePublished": "2026-08-06T16:34:23.931Z",
        "dateUpdated": "2026-08-08T02:12:44.764Z"
    },
    "containers": {
        "cna": {
            "title": "Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-287",
                            "lang": "en",
                            "description": "CWE-287: Improper Authentication",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "HIGH",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 2.1,
                        "baseSeverity": "LOW",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf"
                },
                {
                    "name": "https://github.com/traefik/traefik/pull/13572",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/pull/13572"
                },
                {
                    "name": "https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350"
                },
                {
                    "name": "https://github.com/traefik/traefik/releases/tag/v3.6.25",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/releases/tag/v3.6.25"
                },
                {
                    "name": "https://github.com/traefik/traefik/releases/tag/v3.7.10",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/traefik/traefik/releases/tag/v3.7.10"
                }
            ],
            "affected": [
                {
                    "vendor": "traefik",
                    "product": "traefik",
                    "versions": [
                        {
                            "version": ">= 3.6.11, < 3.6.25",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.7.0, < 3.7.10",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-06T16:34:23.931Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10."
                }
            ],
            "source": {
                "advisory": "GHSA-6765-c87h-8mrf",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-08T02:12:30.362636Z",
                                "id": "CVE-2026-71326",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-08T02:12:44.764Z"
                }
            }
        ]
    }
}