CVE-2026-71191
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | openstack |
| Product | swift |
| Published | Aug 5, 2026 |
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Affected Versions
OpenStack / Swift
2.18.0 < 2.35.4 2.36.0 < 2.36.3 2.37.0 < 2.37.3 2.38.0