A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 (SigV4). Due to improper validation, the service fails to reject requests containing unsigned x-amz- headers, instead simply dropping them from the signature calculation. This allows an attacker who possesses a valid presigned PUT URL to add an unsigned x-amz-copy-source header, effectively converting a simple upload into a CopyObject operation. This can lead to unauthorized access and copying of any data the original signer is permitted to reach across the entire storage system.

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Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

History

Tue, 22 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Mon, 21 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 21 Sep 2026 12:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 (SigV4). Due to improper validation, the service fails to reject requests containing unsigned x-amz- headers, instead simply dropping them from the signature calculation. This allows an attacker who possesses a valid presigned PUT URL to add an unsigned x-amz-copy-source header, effectively converting a simple upload into a CopyObject operation. This can lead to unauthorized access and copying of any data the original signer is permitted to reach across the entire storage system.
Title Noobaa-core: noobaa-core: presigned put url escalation to copyobject via unsigned x-amz-copy-source header
First Time appeared Redhat
Redhat openshift Data Foundation
Weaknesses CWE-347
CPEs cpe:/a:redhat:openshift_data_foundation:4
Vendors & Products Redhat
Redhat openshift Data Foundation
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-21T20:46:26.219Z

Reserved: 2026-09-21T11:13:36.872Z

Link: CVE-2026-94368

cve-icon Vulnrichment

Updated: 2026-09-21T19:40:22.590Z

cve-icon NVD

Status : Received

Published: 2026-09-21T12:17:29.010

Modified: 2026-09-21T21:17:21.680

Link: CVE-2026-94368

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-21T11:00:00Z

Links: CVE-2026-94368 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T19:00:08Z

Weaknesses