CVE-2026-71191 | BDVDB-2026-355604 Detail

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-08-05Record published in the CVE List.
2. Version 22026-08-06Most recent update recorded in the CVE List.