CVE-2025-61771

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In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser` stores non-file form fields (parts without a `filename`) entirely in memory as Ruby `String` objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx `client_max_body_size`) and validating and rejecting unusually large form fields at the application level."}, {"lang": "es", "value": "Rack es una interfaz modular de servidor web Ruby. En versiones anteriores a la 2.2.19, 3.1.17 y 3.2.2, 'Rack::Multipart::Parser' almacena campos de formulario que no son archivos (partes sin un 'filename') completamente en memoria como objetos Ruby 'String'. Un \u00fanico campo de texto grande en una solicitud multipart/form-data (cientos de megabytes o m\u00e1s) puede consumir memoria de proceso equivalente, lo que podr\u00eda llevar a condiciones de falta de memoria (OOM) y denegaci\u00f3n de servicio (DoS). Los atacantes pueden enviar campos grandes que no son archivos para desencadenar un uso excesivo de memoria. El impacto escala con el tama\u00f1o de la solicitud y la concurrencia, lo que podr\u00eda llevar a fallos de los workers o a una sobrecarga severa de la recolecci\u00f3n de basura. Todas las aplicaciones Rack que procesan env\u00edos de formularios multipart est\u00e1n afectadas. Las versiones 2.2.19, 3.1.17 y 3.2.2 imponen un l\u00edmite de tama\u00f1o razonable para los campos que no son archivos (p. ej., 2 MiB). Las soluciones incluyen restringir el tama\u00f1o m\u00e1ximo del cuerpo de la solicitud en la capa del servidor web o proxy (p. ej., Nginx 'client_max_body_size') y validar y rechazar campos de formulario inusualmente grandes a nivel de aplicaci\u00f3n."}], "id": "CVE-2025-61771", "lastModified": "2026-10-19T16:10:00.260", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-61771", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-07T17:51:58.348077Z", "version": "2.0.3"}}]}, "published": "2025-10-07T15:16:03.123", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rack/rack/commit/589127f4ac8b5cf11cf88fb0cd116ffed4d2181e"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rack/rack/commit/d869fed663b113b95a74ad53e1b5cae6ab31f29e"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rack/rack/commit/e08f78c656c9394d6737c022bde087e0f33336fd"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/rack/rack/security/advisories/GHSA-w9pc-fmgc-vxvw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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{"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-fluentd", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-haproxy", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-iscsid", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-manila-api", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-manila-scheduler", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-manila-share", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-mariadb", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-memcached", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-multipathd", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-nova-libvirt", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-openvswitch-base", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-ovn-controller", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-ovn-nb-db-server", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-ovn-northd", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-ovn-sb-db-server", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-qdrouterd", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-rabbitmq", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-redis", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-redis-base", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "rhosp13/openstack-sensu-base", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2025-10-07T14:42:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-61771\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-61771\nhttps://github.com/rack/rack/commit/589127f4ac8b5cf11cf88fb0cd116ffed4d2181e\nhttps://github.com/rack/rack/commit/d869fed663b113b95a74ad53e1b5cae6ab31f29e\nhttps://github.com/rack/rack/commit/e08f78c656c9394d6737c022bde087e0f33336fd\nhttps://github.com/rack/rack/security/advisories/GHSA-w9pc-fmgc-vxvw"], "statement": "The impact is IMPORTANT because this happens over a network and causes a denial of service. Large non-file fields are buffered in memory instead of being streamed or capped, leading to memory exhaustion and worker crashes.", "threat_severity": "Important"}

{"created": "2025-10-08T13:36:33.815853+00:00", "updated": "2025-10-08T13:36:33.815891+00:00", "vendors": ["rack", "rack$PRODUCT$rack"]}