---
id: CVE-2026-54330
title: >-
  Ceph is an open-source distributed storage platform providing object, block,
  and file storage
summary: >-
  Ceph is an open-source distributed storage platform providing object, block,
  and file storage. In versions prior to 20.2.4 and 19.2.6, the Ceph Object
  Gateway (RGW) SigV4 handler does not reject requests that carry x-amz-*
  headers absent…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-347
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:11:56.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54330'
references:
  - url: >-
      https://github.com/ceph/ceph/commit/5837aa8e60471128dbb672b0ff6f1b1feebe08a7
    label: security-advisories@github.com
  - url: >-
      https://github.com/ceph/ceph/commit/5978c866d4a0812fbb024745c4f1e79aaecd6c6a
    label: security-advisories@github.com
  - url: 'https://github.com/ceph/ceph/security/advisories/GHSA-rmjq-ffrm-j6vj'
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54330.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-54330'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2519428'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-54330'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54330'
  - url: 'https://access.redhat.com/errata/RHSA-2026:79101'
  - url: 'https://access.redhat.com/errata/RHSA-2026:79243'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00367
epssPercentile: 0.30395
ingestedAt: '2026-09-08T22:12:30.941Z'
vendor: Red Hat
product: Red Hat Ceph Storage 8.1 Tools
affected:
  - ceph_storage 4
  - ceph_storage 5
  - ceph_storage 6
  - ceph_storage 7
  - ceph_storage 9
  - ceph_storage_8_1_tools
  - ceph_storage 8.1
patched:
  - ceph_storage_8_1_tools
  - ceph_storage 8.1
scores:
  nvd: 8.1
  vendor: 8.2
---

## Overview

Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the Ceph Object Gateway (RGW) SigV4 handler does not reject requests that carry x-amz-* headers absent from the signed header set, allowing anyone holding a presigned URL to attach arbitrary unsigned x-amz-* headers that RGW will honor. AWS S3 requires every x-amz-* header on a SigV4 request to be signed and rejects requests bearing additional unsigned headers, but RGW validates only the headers listed in X-Amz-SignedHeaders and ignores any extra ones, so they take effect without being covered by the signature. By adding such headers to a presigned PUT URL, an attacker can grant themselves more capabilities than the URL's signer intended and escalate their privileges. This issue is fixed in versions 20.2.4 and 19.2.6.

## Remediation

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

## Vendor advisories

- **RHSA-2026:79101** · Red Hat · fixed in: Red Hat Ceph Storage 8.1 Tools · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79101)
- **RHSA-2026:79243** · Red Hat · fixed in: Red Hat Ceph Storage 8.1 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79243)
- **Red Hat VEX** · Important · affected: Red Hat Ceph Storage 4, Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 7, Red Hat Ceph Storage 9 · no fix planned: Red Hat Ceph Storage 4, Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 7, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54330.json)