rootpwn

high · CVSS v3 7.1

CVE-2026-94368

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object …

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.

Scores

Severity
high
CVSS v2
7.5
CVSS v3
7.1
CVSS v4
—
EPSS
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