What’s Vulnerable › Vulnerabilities

CVE-2026-94368: Noobaa-core: noobaa-core: presigned put url escalation to copyobject via unsigned x-amz-copy-source header

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-22
• Weakness: CWE-347

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.

Affected products

• Red Hat Openshift Data Foundation 4: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-94368
• https://bugzilla.redhat.com/show_bug.cgi?id=2537364

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