{"id":"CVE-2026-71191","details":"In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration.","modified":"2026-09-11T03:30:20.687421573Z","published":"2026-08-05T05:01:20.971Z","database_specific":{"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71191.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://opendev.org/openstack/swift"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71191.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71191"},{"type":"ADVISORY","url":"https://openwall.com/lists/oss-security/2026/07/28/26"},{"type":"ADVISORY","url":"https://security.openstack.org/ossa/OSSA-2026-030.html"},{"type":"REPORT","url":"https://launchpad.net/bugs/2158733"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://opendev.org/openstack/swift","events":[{"introduced":"f270466de363499894317b7c671f65e8a912bd53"},{"fixed":"fc875f93e82edf98805d0eead3e3c961673c3ef8"},{"introduced":"82cb5a5d78b91c6af258cd8f06d30f69be90fa18"},{"fixed":"deaa3e4691bb19224f5ef57e7fbcd08b7eff5277"},{"introduced":"555026d200337b39c97eb9dafd26901ff40c7a1d"},{"fixed":"5104042f12efcaf90c28b656a378da8959004826"},{"introduced":"9f5881d5143fd06a328bde2713cd9c61df579289"},{"last_affected":"9f5881d5143fd06a328bde2713cd9c61df579289"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.18.0"},{"fixed":"2.35.4"},{"introduced":"2.36.0"},{"fixed":"2.36.3"},{"introduced":"2.37.0"},{"fixed":"2.37.3"},{"introduced":"2.38.0"},{"last_affected":"2.38.0"}]}}],"versions":["2.38.0","2.37.2","2.36.2","2.35.3","2.35.2","2.36.1","2.37.1","2.37.0","2.36.0","2.35.1","2.35.0","2.34.0","2.33.0","2.32.0","2.31.1","2.31.0","2.30.0","2.29.1","2.29.0","2.28.0","wallaby-em","2.27.0","victoria-em","2.26.0","2.25.0","2.24.0","2.23.0","2.22.0","2.21.0","2.20.0","2.19.0","2.18.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71191.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}