CVE-2026-71191

MediumCVSS 6.0/10Last modified Oct 24, 2026

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

CVSS 4.0 6.0/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-863

Affected software

Source: the vendor's advisory (CNA). 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: Aug 5, 2026
Last modified: Oct 24, 2026
NVD status: Awaiting Analysis

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