{"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":"2026-08-08T03:30:09.124508186Z","published":"2026-08-05T05:01:20.971Z","database_specific":{"cna_assigner":"mitre","cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71191.json","unresolved_ranges":[{"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"}]}]},"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":"9f5881d5143fd06a328bde2713cd9c61df579289"},{"last_affected":"9f5881d5143fd06a328bde2713cd9c61df579289"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.38.0"},{"last_affected":"2.38.0"}]}}],"versions":["2.38.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71191.json"}}],"schema_version":"1.8.0","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"}]}