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CVE-2026-50152

Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing cluster secrets to read-only users

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 Monitor subscription handler fails to properly authorize access to the configuration-key store, allowing any CephX user with only  `mon allow r` capabilities to read the entire store by sending a single crafted MMonSubscribe message. The config-key store holds sensitive secrets including OSD LUKS disk-encryption passphrases and, on cephadm-managed clusters, the SSH private key that cephadm uses to reach every host in the cluster. Because that key grants root on every node under the default cephadm configuration, a low-privileged read-only account can escalate to full cluster and host compromise. This issue is fixed in versions 20.2.4 and 19.2.6

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Ceph
Products
Ceph
CVE-2025-30156

Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgery

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 CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.

CVSS 3.1 · 8.9 High EPSS < 1% KEV · Not listed
Vendors
Ceph
Products
Ceph
CVE-2026-39944

Ceph: CephX AES Authentication error

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 RADOS Gateway (RGW) protects STS session tokens with an AES-128-CBC handler that provides no message authentication, allowing an attacker who holds any valid STS token to tamper with it undetected and escalate to full RGW administrative access. Because the ciphertext is unauthenticated, the attacker can perform a CBC bit-flip on the acct_type, perm_type, and is_admin fields of their own token, and a forged is_admin value triggers a global administrative override that bypasses all capability checks. The attack is reachable remotely over the RGW S3 endpoint and is a self-contained modification of a token the attacker already possesses, requiring no encryption oracle and no network observation. It requires only a single valid STS token, which need not carry any elevated privileges, with STS enabled. This issue is fixed in versions 20.2.4 and 19.2.6.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Ceph
Products
Ceph
CVE-2026-54330

Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation

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.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Ceph
Products
Ceph
CVE-2025-52555

CephFS Permission Escalation Vulnerability in Ceph Fuse mounted FS

Ceph is a distributed object, block, and file storage platform. In versions 17.2.7, 18.2.1 through 18.2.4, and 19.0.0 through 19.2.2, an unprivileged user can escalate to root privileges in a ceph-fuse mounted CephFS by chmod 777 a directory owned by root to gain access. The result of this is that a user could read, write and execute to any directory owned by root as long as they chmod 777 it. This impacts confidentiality, integrity, and availability. It is patched in versions 17.2.8, 18.2.5, and 19.2.3.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ceph
Products
Ceph
CVE-2017-12155

openstack-tripleo-heat-templates: Ceph client keyring is world-readable when deployed by director

A resource-permission flaw was found in the openstack-tripleo-heat-templates package where ceph.client.openstack.keyring is created as world-readable. A local attacker with access to the key could read or modify data on Ceph cluster pools for OpenStack as though the attacker were the OpenStack service, thus potentially reading or modifying data in an OpenStack Block Storage volume.

CVSS 3.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Ceph Redhat
Products
Ceph Openstack
CVE-2015-3010

ceph-deploy: keyring permissions are world readable in ~ceph

ceph-deploy before 1.5.23 uses weak permissions (644) for ceph/ceph.client.admin.keyring, which allows local users to obtain sensitive information by reading the file.

CVSS 2.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Ceph Redhat
Products
Ceph-deploy Ceph Storage
CVE-2015-4053

ceph-deploy admin command copies keyring file to /etc/ceph which is world readable

The admin command in ceph-deploy before 1.5.25 uses world-readable permissions for /etc/ceph/ceph.client.admin.keyring, which allows local users to obtain sensitive information by reading the file.

CVSS 2.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Ceph Redhat
Products
Ceph-deploy Ceph Storage
CVE-2019-10222

ceph: Unauthenticated clients can crash ceph RGW configured with beast as frontend

A flaw was found in the Ceph RGW configuration with Beast as the front end handling client requests. An unauthenticated attacker could crash the Ceph RGW server by sending valid HTTP headers and terminating the connection, resulting in a remote denial of service for Ceph RGW clients.

CVSS 3.1 · 7.5 High EPSS 4.5% KEV · Not listed
Vendors
Ceph Fedoraproject Redhat
Products
Ceph Fedora Ceph Storage
CVE-2020-25677

ceph-ansible: insecure ownership on /etc/ceph/iscsi-gateway.conf configuration file

A flaw was found in Ceph-ansible v4.0.41 where it creates an /etc/ceph/iscsi-gateway.conf with insecure default permissions. This flaw allows any user on the system to read sensitive information within this file. The highest threat from this vulnerability is to confidentiality.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ceph Redhat
Products
Ceph-ansible Ceph Storage Openshift Container Storage
CVE-2020-1716

ceph-ansible: hard coded credential in ceph-ansible playbook

A flaw was found in the ceph-ansible playbook where it contained hardcoded passwords that were being used as default passwords while deploying Ceph services. Any authenticated attacker can abuse this flaw to brute-force Ceph deployments, and gain administrator access to Ceph clusters via the Ceph dashboard to initiate read, write, and delete Ceph clusters and also modify Ceph cluster configurations. Versions before ceph-ansible 6.0.0alpha1 are affected.

CVSS 3.1 · 8.8 High EPSS 1.3% KEV · Not listed
Vendors
Ceph Redhat
Products
Ceph-ansible Ceph Storage
CVE-2020-1700

ceph: connection leak in the RGW Beast front-end permits a DoS against the RGW server

A flaw was found in the way the Ceph RGW Beast front-end handles unexpected disconnects. An authenticated attacker can abuse this flaw by making multiple disconnect attempts resulting in a permanent leak of a socket connection by radosgw. This flaw could lead to a denial of service condition by pile up of CLOSE_WAIT sockets, eventually leading to the exhaustion of available resources, preventing legitimate users from connecting to the system.

CVSS 3.1 · 6.5 Medium EPSS 2.4% KEV · Not listed
Vendors
Canonical Ceph Opensuse and 1 more
Products
Ubuntu Linux Ceph Leap and 1 more
CVE-2018-1129

ceph: cephx uses weak signatures

A flaw was found in the way signature calculation was handled by cephx authentication protocol. An attacker having access to ceph cluster network who is able to alter the message payload was able to bypass signature checks done by cephx protocol. Ceph branches master, mimic, luminous and jewel are believed to be vulnerable.

CVSS 3.0 · 6.5 Medium EPSS 1.9% KEV · Not listed
Vendors
Ceph Debian Opensuse and 1 more
Products
Ceph Debian Linux Leap and 7 more
CVE-2018-10861

ceph: ceph-mon does not perform authorization on OSD pool ops

A flaw was found in the way ceph mon handles user requests. Any authenticated ceph user having read access to ceph can delete, create ceph storage pools and corrupt snapshot images. Ceph branches master, mimic, luminous and jewel are believed to be affected.

CVSS 3.0 · 8.1 High EPSS 3.2% KEV · Not listed
Vendors
Ceph Debian Opensuse and 1 more
Products
Ceph Debian Linux Leap and 6 more
CVE-2017-7519

ceph: libradosstriper processes arbitrary printf placeholders in user input

In Ceph, a format string flaw was found in the way libradosstriper parses input from user. A user could crash an application or service using the libradosstriper library.

CVSS 3.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Ceph Debian
Products
Ceph Debian Linux