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CVE-2026-71191 (GCVE-0-2026-71191)

Vulnerability from cvelistv5 – Published: 2026-08-05 05:01 – Updated: 2026-08-06 13:10
VLAI
Summary
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.
Severity
6 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 13:10 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
OpenStack Swift Affected: 2.18.0 , < 2.35.4 (semver)
Affected: 2.36.0 , < 2.36.3 (semver)
Affected: 2.37.0 , < 2.37.3 (semver)
Affected: 2.38.0 (semver)
    cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*
    cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*
    cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*
    cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*
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Show details on NVD website
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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