CVE-2026-94368 Noobaa-core: noobaa-core: presigned put url escalation to copyobject via unsigned x-amz-copy-source header
Attackers can exploit signature verification flaws to convert presigned uploads into unauthorized copy operations, accessing or modifying data across the storage system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-94368?
CVE-2026-94368 is a high-severity authentication bypass vulnerability in Red Hat Openshift Data Foundation 4, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-94368?
How do I fix CVE-2026-94368?
No fix has been published for CVE-2026-94368 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-94368 being exploited?
There is no known exploitation of CVE-2026-94368 in the wild and no public exploit code.
Sources
Also known as GHSA-5p5f-qvx9-whpj.