Vulnerability · Published Aug 27, 2026 · Assigned by GitHub_M
CVE-2026-50152Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing cluster secrets to read-only users
Critical 9.1
In plain English
A critical-severity security flaw in ceph from ceph. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ceph | no fix listed | DEBIAN-CVE-2026-50152 |
| Debian:13 | ceph | no fix listed | DEBIAN-CVE-2026-50152 |
| Debian:14 | ceph | 20.2.4+ds-1 | DEBIAN-CVE-2026-50152 |
| Ubuntu:22.04:LTS | ceph | no fix listed | UBUNTU-CVE-2026-50152 |
| Ubuntu:24.04:LTS | ceph | no fix listed | UBUNTU-CVE-2026-50152 |
| Ubuntu:26.04:LTS | ceph | no fix listed | UBUNTU-CVE-2026-50152 |
| Ubuntu:26.10 | ceph | no fix listed | UBUNTU-CVE-2026-50152 |
Affected products (as reported)
Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L