---
id: CVE-2026-94368
title: >-
  A flaw was found in the signature verification logic of noobaa-core, the core
  component of the NooBaa Multicloud Object Gateway
summary: >-
  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
  impr…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-347
vendor: Red Hat
product: odf4/mcg-core-rhel9
affected:
  - odf4/mcg-core-rhel9 (all versions)
  - rhceph-dev/odf4-mcg-core-rhel9 (all versions)
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:37:36.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94368'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94368'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2537364'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94368.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94368'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94368'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.0023
epssPercentile: 0.12248
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T19:40:21.563755Z'
ingestedAt: '2026-09-21T12:36:35.289Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Openshift Data Foundation 4 · no fix planned: Red Hat Openshift Data Foundation 4 · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94368.json)