CVE-2026-71191
Last modified
CVE-2026-71191 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| OpenStack | Swift | >= 2.18.0, < 2.35.4; >= 2.36.0, < 2.36.3; >= 2.37.0, < 2.37.3; 2.38.0 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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