CVE-2026-54330: fallo de gravedad alta en ceph
Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.1epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Productos afectados
ceph · cephCVEs relacionadas — ceph
En el mismo producto, de las más peligrosas a las menos.
CVE-2024-47866HIGHRGW DoS attack with empty HTTP header in S3 object copyEPSS 0.5%CVE-2026-39944HIGHCeph: CephX AES Authentication errorEPSS 0.3%CVE-2026-50152CRITICALCeph Monitor subscription handler improperly authorizes config-key store reads, exposing cluster secrets to read-only usersEPSS 0.2%CVE-2024-48916HIGHCeph is vulnerable to authentication bypass through RadosGWEPSS 0.2%CVE-2025-52555MEDIUMCephFS Permission Escalation Vulnerability in Ceph Fuse mounted FSEPSS 0.2%CVE-2025-30156HIGHCeph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgeryEPSS 0.1%