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{"acknowledgement": "Upstream acknowledges Christian Schwede (NVIDIA) as the original reporter.", "bugzilla": {"description": "openstack-swift: openstack-swift: S3API presigned URL unsigned header authorization bypass", "id": "2503670", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503670"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-863", "details": ["A flaw was found in the S3API middleware of OpenStack Swift. The SigV4 presigned URL implementation does not require that semantic x-amz-* headers be included in the request signature. An attacker who obtains a presigned PUT URL can inject unsigned headers such as X-Amz-Copy-Source to copy objects from the signer's storage, bypassing the intended scope of the presigned URL authorization. The attacker needs prior knowledge of the target project_id, container name, and object name."], "mitigation": {"lang": "en:us", "value": "If S3 API compatibility is not required, remove the s3api filter from the proxy-server pipeline in proxy-server.conf. This completely eliminates the attack surface. If S3 API is required, restrict the distribution and scope of presigned PUT URLs as an operational control, and apply the upstream patch when available. There is no configuration-only workaround that fully mitigates this issue while keeping S3 API functionality enabled."}, "name": "CVE-2026-71191", "package_state": [{"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "rhosp13/openstack-swift-account", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "rhosp13/openstack-swift-base", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "rhosp13/openstack-swift-container", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "rhosp13/openstack-swift-object", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "rhosp13/openstack-swift-proxy-server", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "openstack-swift", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "rhosp-rhel8/openstack-swift-account", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "rhosp-rhel8/openstack-swift-base", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "rhosp-rhel8/openstack-swift-container", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "rhosp-rhel8/openstack-swift-object", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "rhosp-rhel8/openstack-swift-proxy-server", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "openstack-swift", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "rhosp-rhel9/openstack-swift-account", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "rhosp-rhel9/openstack-swift-base", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "rhosp-rhel9/openstack-swift-container", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "rhosp-rhel9/openstack-swift-object", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "rhosp-rhel9/openstack-swift-proxy-server", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "openstack-swift", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso/openstack-swift-account-rhel9", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso/openstack-swift-base-rhel9", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso/openstack-swift-container-rhel9", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso/openstack-swift-object-rhel9", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso/openstack-swift-proxy-server-rhel9", "product_name": "Red Hat OpenStack Platform 18.0"}], "public_date": "2026-07-28T15:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-71191\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-71191\nhttps://launchpad.net/bugs/2158733"], "statement": "Red Hat OpenStack Platform (RHOSP) and Red Hat OpenStack Services on OpenShift (RHOSO) ship openstack-swift and are affected by this vulnerability. In default RHOSO deployments, the s3api filter is included in the active proxy-server pipeline, and the s3_acl option is not explicitly set (defaulting to false). SigV4 presigned URL requests are processed through the S3API middleware and are vulnerable. All RHOSP (13, 16.2, 17.1) and RHOSO (18.0) deployments with s3api enabled in the pipeline are affected.", "threat_severity": "Important"}

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