CVE Catalog

CVE-2026-94368

HighCVSS 7.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.14%

4th percentile - higher than 4% of all known CVEs

Summary

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway, when processing S3 presigned URLs using Signature Version 4 (SigV4). The service fails to reject requests containing unsigned x-amz- headers, instead dropping them from the signature calculation. This allows an attacker with a valid presigned PUT URL to add an unsigned x-amz-copy-source header, converting a simple upload into a CopyObject operation.

Risk Assessment

An attacker can gain unauthorized access and copy any data the original signer is permitted to reach across the entire storage system. This represents a serious breach of data confidentiality and integrity.

Recommendation

Update noobaa-core to a version containing the fix for x-amz- header validation in SigV4 presigned URLs. Until patched, consider restricting issuance of presigned PUT URLs or monitoring for unusual CopyObject operations.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS