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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-71191 Detail

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

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  MITRE
CVSS-B 6.0 MEDIUM
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://launchpad.net/bugs/2158733 MITRE
https://openwall.com/lists/oss-security/2026/07/28/26 MITRE
https://security.openstack.org/ossa/OSSA-2026-030.html MITRE

Weakness Enumeration

CWE-ID CWE Name Source
CWE-863 Incorrect Authorization MITRE  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-71191
NVD Published Date:
08/05/2026
NVD Last Modified:
08/05/2026
Source:
MITRE