CVE-2026-6406

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When ECI is enabled, Docker socket mounts from containers are denied unless explicitly allowed via the admin-settings configuration. However, the --use-api-socket flag adds the Docker socket mount via the HostConfig.Mounts field rather than the HostConfig.Binds field. The ECI enforcement in the Docker Desktop API proxy only inspected Binds, allowing the mount to pass unchecked. This grants a container full access to the Docker Engine socket and, if the host user has logged in to container registries, their authentication credentials.\n\nA local attacker with the ability to run Docker CLI commands can exploit this to escape ECI restrictions, access the Docker Engine, and potentially escalate privileges.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "The Docker CLI <code>--use-api-socket</code> flag bypasses Enhanced Container Isolation (ECI) restrictions in Docker Desktop. When ECI is enabled, Docker socket mounts from containers are denied unless explicitly allowed via the admin-settings configuration. However, the <code>--use-api-socket</code> flag adds the Docker socket mount via the <code>HostConfig.Mounts</code> field rather than the <code>HostConfig.Binds</code> field. The ECI enforcement in the Docker Desktop API proxy only inspected <code>Binds</code>, allowing the mount to pass unchecked. This grants a container full access to the Docker Engine socket and, if the host user has logged in to container registries, their authentication credentials.<br><br>A local attacker with the ability to run Docker CLI commands can exploit this to escape ECI restrictions, access the Docker Engine, and potentially escalate privileges."}]}], "references": [{"url": "https://docs.docker.com/desktop/release-notes/#4590", "tags": ["release-notes"]}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-26-299/", "tags": ["third-party-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}}], "configurations": [{"lang": "en", "value": "Docker Desktop with Enhanced Container Isolation (ECI) enabled (requires Docker Business subscription)", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Docker Desktop with Enhanced Container Isolation (ECI) enabled (requires Docker Business subscription)"}]}], "workarounds": [{"lang": "en", "value": "Upgrade to Docker Desktop 4.59.0 or later. 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As a workaround, restrict which users can execute Docker CLI commands on the host.", "supportingMedia": [{"type": "text/html", "value": "Upgrade to Docker Desktop 4.59.0 or later. As a workaround, restrict which users can execute Docker CLI commands on the host.", "base64": false}]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "The Docker CLI --use-api-socket flag bypasses Enhanced Container Isolation (ECI) restrictions in Docker Desktop. When ECI is enabled, Docker socket mounts from containers are denied unless explicitly allowed via the admin-settings configuration. However, the --use-api-socket flag adds the Docker socket mount via the HostConfig.Mounts field rather than the HostConfig.Binds field. The ECI enforcement in the Docker Desktop API proxy only inspected Binds, allowing the mount to pass unchecked. 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This grants a container full access to the Docker Engine socket and, if the host user has logged in to container registries, their authentication credentials.<br><br>A local attacker with the ability to run Docker CLI commands can exploit this to escape ECI restrictions, access the Docker Engine, and potentially escalate privileges.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization"}]}], "configurations": [{"lang": "en", "value": "Docker Desktop with Enhanced Container Isolation (ECI) enabled (requires Docker Business subscription)", "supportingMedia": [{"type": "text/html", "value": "Docker Desktop with Enhanced Container Isolation (ECI) enabled (requires Docker Business subscription)", "base64": false}]}], "providerMetadata": {"orgId": "686469e6-3ff6-451b-ab8b-cf5b9e89401e", "shortName": "Docker", "dateUpdated": "2026-05-22T18:32:15.959Z"}}}, "cveMetadata": {"cveId": "CVE-2026-6406", "state": "PUBLISHED", "dateUpdated": "2026-05-22T19:48:57.000Z", "dateReserved": "2026-04-15T21:42:36.201Z", "assignerOrgId": "686469e6-3ff6-451b-ab8b-cf5b9e89401e", "datePublished": "2026-05-22T18:32:15.959Z", "assignerShortName": "Docker"}, "dataVersion": "5.2"}

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When ECI is enabled, Docker socket mounts from containers are denied unless explicitly allowed via the admin-settings configuration. However, the --use-api-socket flag adds the Docker socket mount via the HostConfig.Mounts field rather than the HostConfig.Binds field. The ECI enforcement in the Docker Desktop API proxy only inspected Binds, allowing the mount to pass unchecked. This grants a container full access to the Docker Engine socket and, if the host user has logged in to container registries, their authentication credentials.\n\nA local attacker with the ability to run Docker CLI commands can exploit this to escape ECI restrictions, access the Docker Engine, and potentially escalate privileges."}, {"lang": "es", "value": "La bandera '--use-api-socket' de Docker CLI elude las restricciones de Aislamiento Mejorado de Contenedores (ECI) en Docker Desktop. Cuando ECI est\u00e1 habilitado, los montajes de sockets de Docker desde los contenedores son denegados a menos que se permitan expl\u00edcitamente a trav\u00e9s de la configuraci\u00f3n de admin-settings . Sin embargo, la bandera '--use-api-socket' a\u00f1ade el montaje del socket de Docker a trav\u00e9s del campo 'HostConfig.Mounts' en lugar del campo 'HostConfig.Binds'. La aplicaci\u00f3n de ECI en el proxy de la API de Docker Desktop solo inspeccionaba Binds , permitiendo que el montaje pasara sin ser verificado. Esto otorga a un contenedor acceso completo al socket del Docker Engine y, si el usuario del host ha iniciado sesi\u00f3n en registros de contenedores, sus credenciales de autenticaci\u00f3n.\n\nUn atacante local con la capacidad de ejecutar comandos de Docker CLI puede explotar esto para evadir las restricciones de ECI, acceder al Docker Engine y potencialmente escalar privilegios."}], "id": "CVE-2026-6406", "lastModified": "2026-07-23T16:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "security@docker.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@docker.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6406", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-22T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-05-22T19:17:04.827", "references": [{"source": "security@docker.com", "tags": ["Release Notes"], "url": "https://docs.docker.com/desktop/release-notes/#4590"}, {"source": "security@docker.com", "tags": ["Third Party Advisory"], "url": "https://www.zerodayinitiative.com/advisories/ZDI-26-299/"}], "sourceIdentifier": "security@docker.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security@docker.com", "type": "Secondary"}]}

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