{"id":"AZL-98340","summary":"CVE-2026-54330 affecting package ceph 18.2.2-12","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":"2026-09-03T05:27:10Z","published":"2026-08-28T00:18:07Z","upstream":["CVE-2026-54330"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54330"}],"affected":[{"package":{"name":"ceph","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/ceph"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"18.2.2-12"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-98340.json"}}],"schema_version":"1.9.0"}