{"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": "2026-08-06T16:34:23.931Z"}, "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"}}}}

{}

{}

{}

{}