CVE-2026-50152: Ceph

Critical severity, CVSS 9.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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

Affected products

• Ceph Ceph: from 19.0.0, before 19.2.6 (fixed in 19.2.6); from 20.0.0, before 20.2.4 (fixed in 20.2.4)

Published 2026-08-28. Last modified 2026-09-08.