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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-54330)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:79101 advisory.

    Red Hat Ceph Storage is a scalable, open, software-defined storage platform that combines the most stable     version of the Ceph storage system with a Ceph management platform, deployment utilities, and support     services.

    These new packages include numerous security and bug fixes. Space precludes documenting all of these     changes in this advisory. Users are directed to the Red Hat Ceph Storage Release Notes for information on     the most significant of these changes:

    https://docs.redhat.com/en/documentation/red_hat_ceph_storage/8/html/8.1_release_notes

    ==========================================     IMPORTANT:
    The Red Hat Ceph Storage team has migrated our defect tracking from Bugzilla to an internal Jira system.
    Bug fixes and CVE information that was previously listed in the errata releases are now listed in the     Release Notes.

    Refer to the release notes going forward for the latest and most accurate fix and CVE information.
    ==========================================

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8867-1 advisory.

    It was discovered that the Ceph Object Gateway (RGW) SigV4 handler did not reject requests carrying     x-amz-* headers that were absent from the signed header set. An attacker holding a presigned URL could     possibly use this issue to attach arbitrary unsigned x-amz-* headers that RGW would honor, allowing them     to escalate their privileges beyond what the URL's signer intended.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7de7d03796 advisory.

    # Ceph 20.2.4 GA

    * CVE-2025-30156 is an authentication bypass in CephX caused by misuse of AES-CBC.
    >    https://docs.ceph.com/en/latest/security/CVE-2025-30156
    * CVE-2026-39944 shares the unauthenticated-encryption root cause of CVE-2025-30156     >    https://docs.ceph.com/en/latest/security/CVE-2026-39944
    * CVE-2026-50152 is an improper authorization flaw in the Ceph Monitor subscription handler.
    >    https://docs.ceph.com/en/latest/security/CVE-2026-50152
    * CVE-2026-54330 is a flaw in RGW not properly verifying its SigV4 cryptographic signatures in RGW's SigV4     verifier.
    >    https://docs.ceph.com/en/latest/security/CVE-2026-54330



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ebffec502b advisory.

    # Ceph 19.2.6 GA

    * CVE-2025-30156 is an authentication bypass in CephX caused by misuse of AES-CBC.
    >    https://docs.ceph.com/en/latest/security/CVE-2025-30156
    * CVE-2026-39944 shares the unauthenticated-encryption root cause of CVE-2025-30156     >    https://docs.ceph.com/en/latest/security/CVE-2026-39944
    * CVE-2026-50152 is an improper authorization flaw in the Ceph Monitor subscription handler.
    >    https://docs.ceph.com/en/latest/security/CVE-2026-50152
    * CVE-2026-54330 is a flaw in RGW not properly verifying its SigV4 cryptographic signatures in RGW's SigV4     verifier.
    >    https://docs.ceph.com/en/latest/security/CVE-2026-54330


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-54330)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
478672	Echo: ceph: security update to 20.2.4+ds-1	Tenable Cloud Security	Echo Local Security Checks	Local	high
478672	Echo: ceph: security update to 20.2.4+ds-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
369296	RHEL 9 : Red Hat Ceph Storage 8.1 (RHSA-2026:79101)	Nessus	Red Hat Local Security Checks	Local	medium
363111	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 26.04 LTS : Ceph vulnerability (USN-8867-1)	Nessus	Ubuntu Local Security Checks	Local	high
338829	Fedora 44 : ceph (2026-7de7d03796)	Nessus	Fedora Local Security Checks	Local	critical
338789	Fedora 43 : ceph (2026-ebffec502b)	Nessus	Fedora Local Security Checks	Local	critical
338299	Linux Distros Unpatched Vulnerability : CVE-2026-54330	Nessus	Misc.	Local	high

Detections

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CVE-2026-54330

high

Tenable Plugins

high

high

medium

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critical

critical

high