{"id":"CVE-2026-71191","published":"2026-08-05T06:16:40.180","lastModified":"2026-08-06T14:16:41.673","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-863"],"vendors":[],"products":[],"references":[{"url":"https://launchpad.net/bugs/2158733","tags":[]},{"url":"https://openwall.com/lists/oss-security/2026/07/28/26","tags":[]},{"url":"https://security.openstack.org/ossa/OSSA-2026-030.html","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}