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Fencer Vulns
critical 9.1

CVE-2026-50152 json

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

published 2026-08-27 2 mo ago modified 2026-09-08 2 mo ago also BIT-ceph-2026-50152 , EUVD-2026-67274 , GHSA-rg9p-5xcp-wm8h

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

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 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

Patch / fix

  • bitnami ceph 19.2.6, 20.2.4
  • linuxfoundation ceph 19.2.6, 20.2.4
  • redhat ceph 19.2.6, 20.2.4
  • ceph Debian 14 20.2.4+ds-1

debian advisories DEBIAN-CVE-2026-50152

  • ceph ceph storage 8.1 2:19.2.1-423.el9cp
  • cephadm ceph storage 8.1 2:19.2.1-423.el9cp
  • librbd1 ceph storage 8.1 2:19.2.1-423.el9cp
  • librgw2 ceph storage 8.1 2:19.2.1-423.el9cp
  • rbd-nbd ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-mib ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-base ceph storage 8.1 2:19.2.1-423.el9cp
  • ceph-fuse ceph storage 8.1 2:19.2.1-423.el9cp

red hat advisories RHSA-2026:79101

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50152 updated cvss 8.2

ceph: ceph: MON subscription handler exposes config-key store to low-privilege CephX users

  • Red Hat Ceph Storage 4 ceph, librbd1, librgw2, rbd-nbd, ceph-mds, ceph-mgr, +27 more Red Hat Ceph Storage 5 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mds, +33 more Red Hat Ceph Storage 6 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 7 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 8 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +17 more Red Hat Ceph Storage 9 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +18 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 7.1 rhceph/rhceph-7-rhel9 1791452477
    fixed: vendor fix RHSA-2026:83548
  • Red Hat Ceph Storage 8.1 rhceph/rhceph-8-rhel9 1791176990
    fixed: vendor fix RHSA-2026:79243
  • Red Hat Ceph Storage 9.2 rhceph/rhceph-9-rhel10 1790843527
    fixed: vendor fix RHSA-2026:86618
  • Red Hat Ceph Storage 7.1 rhceph/grafana-rhel9 1791450715, rhceph/keepalived-rhel9 1791453133, rhceph/snmp-notifier-rhel9 1791450035, rhceph/rhceph-haproxy-rhel9 1791452229, rhceph/rhceph-promtail-rhel9 1791451373 Red Hat Ceph Storage 8.1 rhceph/grafana-rhel9 1791176238, rhceph/keepalived-rhel9 1791175257, rhceph/oauth2-proxy-rhel9 1791176282, rhceph/snmp-notifier-rhel9 1791176336, rhceph/rhceph-haproxy-rhel9 1791176338, rhceph/rhceph-promtail-rhel9 1791176366 Red Hat Ceph Storage 9.2 rhceph/alloy-rhel10 1790774976, rhceph/grafana-rhel10 1790774121, rhceph/keepalived-rhel10 1790842990, rhceph/oauth2-proxy-rhel10 1790774021, rhceph/snmp-notifier-rhel10 1790773439, rhceph/rhceph-haproxy-rhel10 1790846345
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Affected packages

ecosystem package affected fixed in
bitnami ceph
>=19.0.0, <19.2.6
>=20.0.0, <20.2.4
19.2.6
20.2.4

Affected products

  • ceph ceph

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.