{"id":"CVE-2026-39944","aliases":["BIT-ceph-2026-39944","DEBIAN-CVE-2026-39944","EUVD-2026-67315","GHSA-j73r-qrgx-jvq2","MGASA-2026-0389","RHSA-2026:79101","UBUNTU-CVE-2026-39944"],"status":"published","title":"Ceph: CephX AES Authentication error","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 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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00285,"percentile":0.21273,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-327"],"published":"2026-08-27T20:47:01Z","modified":"2026-10-28T02:30:35Z","fixes":[{"ecosystem":"Bitnami","package":"ceph","fixed_in":["19.2.6","20.2.4"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"ceph","fixed_in":["20.2.4+ds-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"ceph","ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0"},{"fixed":"19.2.6"},{"introduced":"20.0.0"},{"fixed":"20.2.4"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.2.11+ds-2","16.2.11+ds-3","16.2.11+ds-4","16.2.11+ds-5","16.2.11+ds-5.1","16.2.15+ds-0+deb12u1","16.2.15+ds-0+deb12u2","18.2.0+ds-1","18.2.0+ds-2","18.2.0+ds-3","18.2.0+ds-4","18.2.0+ds-5","18.2.0+ds-6","18.2.0+ds-7","18.2.0+ds-8","18.2.1+ds-1","18.2.1+ds-2","18.2.1+ds-3","18.2.1+ds-4","18.2.1+ds-5","18.2.1+ds-6","18.2.1+ds-7","18.2.1+ds-8","18.2.1+ds-9","18.2.3+ds-1","18.2.3+ds-2","18.2.3+ds-3","18.2.3+ds-3+loong64","18.2.4+ds-1","18.2.4+ds-10","18.2.4+ds-11","18.2.4+ds-12","18.2.4+ds-13","18.2.4+ds-2","18.2.4+ds-3","18.2.4+ds-4","18.2.4+ds-5","18.2.4+ds-6","18.2.4+ds-7","18.2.4+ds-8","18.2.4+ds-9","18.2.6-1","18.2.7+ds-1","18.2.7+ds-1.1","18.2.7-1","18.2.7-2","18.2.8+ds-1","18.2.8+ds-2","18.2.8+ds-2.1","20.2.2+ds-1","20.2.2+ds-10","20.2.2+ds-11","20.2.2+ds-12","20.2.2+ds-13","20.2.2+ds-2","20.2.2+ds-3","20.2.2+ds-4","20.2.2+ds-5","20.2.2+ds-6","20.2.2+ds-7","20.2.2+ds-8","20.2.2+ds-9","20.2.4+ds-1"]},{"source":"osv","ecosystem":"Debian:13","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["18.2.7+ds-1","18.2.7+ds-1+deb13u1","18.2.7+ds-1.1","18.2.8+ds-1","18.2.8+ds-2","18.2.8+ds-2.1","20.2.2+ds-1","20.2.2+ds-10","20.2.2+ds-11","20.2.2+ds-12","20.2.2+ds-13","20.2.2+ds-2","20.2.2+ds-3","20.2.2+ds-4","20.2.2+ds-5","20.2.2+ds-6","20.2.2+ds-7","20.2.2+ds-8","20.2.2+ds-9","20.2.4+ds-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20.2.4+ds-1"}]}],"versions":["18.2.7+ds-1","18.2.7+ds-1.1","18.2.8+ds-1","18.2.8+ds-2","18.2.8+ds-2.1","20.2.2+ds-1","20.2.2+ds-10","20.2.2+ds-11","20.2.2+ds-12","20.2.2+ds-13","20.2.2+ds-2","20.2.2+ds-3","20.2.2+ds-4","20.2.2+ds-5","20.2.2+ds-6","20.2.2+ds-7","20.2.2+ds-8","20.2.2+ds-9"]},{"source":"osv","ecosystem":"Mageia:10","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20.2.4-1.mga10"}]}],"bundled":4},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-base-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-common-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-debugsource","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-exporter-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-fuse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-fuse-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-immutable-object-cache","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-immutable-object-cache-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-mds-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-mgr-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-mib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-mon-client-nvmeof-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-mon-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-osd-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-radosgw-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-resource-agents","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-selinux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"ceph-test-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"cephadm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"cephfs-mirror-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"cephfs-top","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs-daemon-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs-proxy2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs-proxy2-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephfs2-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libcephsqlite-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librados-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librados-devel-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librados2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librados2-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libradospp-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libradosstriper1","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"libradosstriper1-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librbd-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librbd1","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librbd1-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librgw-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librgw2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"librgw2-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-ceph-argparse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-ceph-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-cephfs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-cephfs-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rados","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rados-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rbd-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rgw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"python3-rgw-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"rbd-fuse-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"rbd-mirror-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"rbd-nbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:ceph_storage:8.1::el9","package":"rbd-nbd-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:19.2.1-423.el9cp"}]}],"bundled":6},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["14.2.2-0ubuntu3","14.2.2-0ubuntu4","14.2.4-0ubuntu1","14.2.4-0ubuntu2","14.2.4-0ubuntu3","15.1.0-0ubuntu2","15.1.0-0ubuntu3","15.1.1-0ubuntu1","15.2.0-0ubuntu1","15.2.0-0ubuntu2","15.2.1-0ubuntu1","15.2.1-0ubuntu2","15.2.3-0ubuntu0.20.04.1","15.2.3-0ubuntu0.20.04.2","15.2.5-0ubuntu0.20.04.1","15.2.7-0ubuntu0.20.04.1","15.2.7-0ubuntu0.20.04.2","15.2.8-0ubuntu0.20.04.1","15.2.11-0ubuntu0.20.04.2","15.2.12-0ubuntu0.20.04.1","15.2.13-0ubuntu0.20.04.1","15.2.13-0ubuntu0.20.04.2","15.2.14-0ubuntu0.20.04.1","15.2.14-0ubuntu0.20.04.2","15.2.16-0ubuntu0.20.04.1","15.2.17-0ubuntu0.20.04.1","15.2.17-0ubuntu0.20.04.3","15.2.17-0ubuntu0.20.04.4","15.2.17-0ubuntu0.20.04.5","15.2.17-0ubuntu0.20.04.6","15.2.17-0ubuntu0.20.04.6+esm1","15.2.17-0ubuntu0.20.04.6+esm2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.2.6-0ubuntu1","16.2.6-0ubuntu2","16.2.6-0ubuntu3","16.2.7-0ubuntu1","16.2.7-0ubuntu4","17.1.0-0ubuntu1","17.1.0-0ubuntu2","17.1.0-0ubuntu3","17.2.0-0ubuntu0.22.04.1","17.2.0-0ubuntu0.22.04.2","17.2.5-0ubuntu0.22.04.2","17.2.5-0ubuntu0.22.04.3","17.2.6-0ubuntu0.22.04.1","17.2.6-0ubuntu0.22.04.2","17.2.6-0ubuntu0.22.04.3","17.2.7-0ubuntu0.22.04.1","17.2.7-0ubuntu0.22.04.2","17.2.9-0ubuntu0.22.04.1","17.2.9-0ubuntu0.22.04.2","17.2.9-0ubuntu0.22.04.3","17.2.9-0ubuntu0.22.04.4"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["18.2.0-0ubuntu3","18.2.0-0ubuntu6","18.2.0-0ubuntu7","19.2.0~git20240301.4c76c50-0ubuntu3","19.2.0~git20240301.4c76c50-0ubuntu4","19.2.0~git20240301.4c76c50-0ubuntu6","19.2.0~git20240301.4c76c50-0ubuntu6.1","19.2.0-0ubuntu0.24.04.1","19.2.0-0ubuntu0.24.04.2","19.2.1-0ubuntu0.24.04.2","19.2.3-0ubuntu0.24.04.1","19.2.3-0ubuntu0.24.04.2","19.2.3-0ubuntu0.24.04.3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.2.0-0ubuntu2","20.2.1-0ubuntu1","20.2.1-0ubuntu3","20.2.4+ds-0ubuntu1","20.2.4+ds1-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ceph","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["19.2.1-0ubuntu3","19.2.3-0ubuntu2","19.2.3-0ubuntu3","19.2.3-0ubuntu4","20.2.0-0ubuntu1","20.2.0-0ubuntu2","20.2.0-0ubuntu2.1"]}],"products":[{"vendor":"ceph","product":"ceph"}],"references":[{"url":"https://github.com/ceph/ceph/security/advisories/GHSA-j73r-qrgx-jvq2","tags":["x_refsource_CONFIRM","web","advisory","report"]},{"url":"https://github.com/ceph/ceph/releases/tag/v19.2.6","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/ceph/ceph/releases/tag/v20.2.4","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39944","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39944.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-39944","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0389.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=36147","tags":["report"]},{"url":"https://docs.ceph.com/en/latest/rados/configuration/auth-config-ref/index.html#upgrading-and-rotating-cephx-keys","tags":["web"]},{"url":"https://www.openwall.com/lists/oss-security/2026/08/19/4","tags":["web"]},{"url":"https://github.com/ceph/ceph/security/advisories/GHSA-rmjq-ffrm-j6vj","tags":["advisory"]},{"url":"https://docs.ceph.com/en/latest/security/CVE-2025-30156/","tags":["advisory"]},{"url":"https://web.mit.edu/tlyu/papers/krb4peril-ndss04.pdf","tags":["web"]},{"url":"https://github.com/ceph/ceph/security/advisories/GHSA-rg9p-5xcp-wm8h","tags":["advisory"]},{"url":"https://docs.ceph.com/en/latest/security/CVE-2026-50152/","tags":["advisory"]},{"url":"https://docs.ceph.com/en/latest/security/CVE-2026-54330","tags":["advisory"]},{"url":"https://docs.ceph.com/en/latest/security/CVE-2026-39944","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:79101","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2254210","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2329846","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2393864","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519423","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519428","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519431","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_79101.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-48795","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-48795","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-48795","tags":["advisory"]},{"url":"https://access.redhat.com/solutions/7071748","tags":["article"]},{"url":"https://terrapin-attack.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2024-48916","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-48916","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-48916","tags":["advisory"]},{"url":"https://github.com/ceph/ceph/pull/60624/commits/919da3696668a07c6810dfa39301950c81c2eba4","tags":["article"]},{"url":"https://github.com/ceph/ceph/security/advisories/GHSA-5g9m-mmp6-93mq","tags":["article"]},{"url":"https://tracker.ceph.com/issues/68836","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-30156","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-30156","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30156","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-39944","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39944","tags":["advisory","report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-50152","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-50152","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50152","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-54330","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-54330","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54330","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-39944","tags":["report"]},{"url":"https://docs.ceph.com/en/latest/security/CVE-2026-39944/","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-39944","title":"Ceph: CephX AES Authentication error","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 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.","status":"published","published":"2026-08-27T20:47:01.512Z","modified":"2026-09-01T03:56:15.659Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:20:02.662847Z"}],"euvd":[{"id":"EUVD-2026-67315","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 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.","status":"published","published":"2026-08-27T20:47:01Z","modified":"2026-09-01T03:56:15Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:01:19.285273Z"}],"nvd":[{"id":"CVE-2026-39944","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 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.","status":"published","published":"2026-08-28T00:17:27.86Z","modified":"2026-09-08T21:11:56.25Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:12:42.035353Z"}],"osv":[{"id":"CVE-2026-39944","title":"Ceph: CephX AES Authentication error","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 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.","status":"published","published":"2026-08-27T20:47:01.512Z","modified":"2026-10-28T02:30:35.580678304Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"DEBIAN-CVE-2026-39944","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 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.","status":"published","published":"2026-08-28T00:17:27.86Z","modified":"2026-10-01T03:03:22.550907994Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:54.892385Z"},{"id":"RHSA-2026:79101","title":"Red Hat Security Advisory: Red Hat Ceph Storage 8.1 security and bug fix updates","status":"published","published":"2026-10-10T10:22:40Z","modified":"2026-10-17T10:20:31Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"UBUNTU-CVE-2026-39944","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 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.","status":"published","published":"2026-08-28T00:17:00Z","modified":"2026-10-17T12:58:13.754658334Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"BIT-ceph-2026-39944","title":"Ceph: CephX AES Authentication error","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 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.","status":"published","published":"2026-09-02T14:37:33.267Z","modified":"2026-09-02T16:25:22.999852404Z","updated_at":"2026-11-02T15:28:28.70813Z"},{"id":"MGASA-2026-0389","title":"Updated ceph packages fix security vulnerabilities","description":"Updated ceph packages fix various security issues allowing\nauthentication bypasses to gain admin privileges on the OSD, MDS, and\nMGR services. Notice that some of the fixes require kernel support for\naes256k (introduced in kernel 7). This update will not break installs\nusing the old (and insecure) AES keys; warnings will appear to migrate\nall keys (check out \"ceph health detail\" or \"ceph status\").\n","status":"published","published":"2026-09-09T23:52:21Z","modified":"2026-09-10T00:12:25.013579669Z","updated_at":"2026-11-02T15:49:43.795591Z"}]}}