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6.0 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…

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 and versions

Product Affected versions Fixed in
Swift 2.38.0 No fix stated
Swift 2.37 2.37.0 → < 2.37.3 2.37.3
Swift 2.36 2.36.0 → < 2.36.3 2.36.3
Swift 2.18 2.18.0 → < 2.35.4 2.35.4

Other CVEs of Swift

The 6 CVEs of Swift →
CVE-2026-97149 In OpenStack Swift before 2.38.2, the tempurl middleware does not reject the X-Copy-From header on PUT requests 5.3 Medium CVE-2026-71192 In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize Swift-native control headers (X-Copy-From,… 6.0 Medium CVE-2026-71190 In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to… 8.7 High CVE-2026-50221 In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host,… 5.3 Medium
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