{"id":"CVE-2026-71191","state":"PUBLISHED","title":"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 obt","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.","publishedAt":"2026-08-05T05:01:20.971Z","updatedAt":"2026-08-06T13:10:38.459Z","severity":{"score":6,"label":"Medium","version":"4.0","vector":"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","source":"mitre"},"assigner":"mitre","products":["OpenStack Swift"],"affected":[{"vendor":"OpenStack","product":"Swift","defaultStatus":"unaffected","versions":[{"version":"2.18.0","status":"affected","lessThan":"2.35.4","versionType":"semver"},{"version":"2.36.0","status":"affected","lessThan":"2.36.3","versionType":"semver"},{"version":"2.37.0","status":"affected","lessThan":"2.37.3","versionType":"semver"},{"version":"2.38.0","status":"affected","versionType":"semver"}],"repo":"https://opendev.org/openstack/swift"}],"references":["https://launchpad.net/bugs/2158733","https://openwall.com/lists/oss-security/2026/07/28/26","https://security.openstack.org/ossa/OSSA-2026-030.html"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71191.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71191","state":"PUBLISHED","datePublished":"2026-08-05T05:01:20.971Z","dateUpdated":"2026-08-06T13:10:38.459Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-08-05T05:01:20.566Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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. 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