{"id":"DEBIAN-CVE-2026-54330","details":"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.","modified":"2026-09-09T08:47:25.206033823Z","published":"2026-08-28T00:18:07.683Z","upstream":["CVE-2026-54330"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-54330"}],"affected":[{"package":{"name":"ceph","ecosystem":"Debian:12","purl":"pkg:deb/debian/ceph?arch=source&distro=bookworm"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54330.json"}},{"package":{"name":"ceph","ecosystem":"Debian:13","purl":"pkg:deb/debian/ceph?arch=source&distro=trixie"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54330.json"}},{"package":{"name":"ceph","ecosystem":"Debian:14","purl":"pkg:deb/debian/ceph?arch=source&distro=forky"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54330.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}