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CVE PROGRAM SOURCE RECORD6.0 Medium

CVE-2026-71191

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

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Status
Published
Published
Updated
Assigning organization
mitre

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

OpenStack Swift

Default version status: unaffected

  • 2.18.0 to < 2.35.4affected
  • 2.36.0 to < 2.36.3affected
  • 2.37.0 to < 2.37.3affected
  • 2.38.0affected

References