PT-2026-129130

An access control bypass flaw was found in Samba's vfs ceph rgw module in it's openat function. An authenticated user can bypass access controls to read or overwrite restricted files on shares configured with the experimental vfs ceph rgw module. When a client requests an existing file using...

ceph: ceph: RGW SigV4 verifier allows attachment of arbitrary unsigned x-amz-* headers leading to privilege escalation

A flaw was found in Ceph RGW's SigV4 signature verification handler. When processing S3 requests, RGW verifies only the headers explicitly listed in the X-Amz-SignedHeaders field but does not reject requests that carry additional unsigned x-amz- headers. This diverges from the AWS S3 specificatio...

ceph: ceph: RGW STS session tokens vulnerable to CBC bit-flip attack enabling admin privilege escalation

A flaw was found in Ceph RGW's STS Security Token Service session token implementation. The STS tokens use the same unauthenticated AES-128-CBC encryption as CephX, which lacks message authentication and uses a hardcoded initialization vector. Because there is no integrity protection on the token...

USN-8867-1 ceph vulnerability

It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the signed header set. An attacker holding a presigned URL could possibly use this issue to attach arbitrary unsigned x-amz- headers that RGW would honor, allowin...

USN-8867-1: Ceph vulnerability

It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the signed header set. An attacker holding a presigned URL could possibly use this issue to attach arbitrary unsigned x-amz- headers that RGW would honor, allowin...

BIT-CEPH-2026-54330 Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation

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 presigne...

BIT-CEPH-2026-39944 Ceph: CephX AES Authentication error

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 ST...

AZL-98340 CVE-2026-54330 affecting package ceph for versions less than 18.2.2-13

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 presigne...

CVE-2026-39944

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 ST...

CVE-2026-54330

CVE-2026-54330 affects the Ceph Object Gateway (RGW) SigV4 verifier in versions prior to 20.2.4 and 19.2.6 . The handler fails to reject requests carrying x-amz-* headers that are absent from the signed header set, unlike AWS S3 which rejects such unsigned headers. An attacker holding a presigned...

CVE-2026-54330 Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation

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 presigne...

CVE-2026-54330 Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation

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 presigne...

CVE-2026-54330 Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation

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 presigne...

CVE-2026-54330

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 presigne...

CVE-2026-39944 Ceph: CephX AES Authentication error

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 ST...

CVE-2026-39944

CVE-2026-39944 affects the Ceph RADOS Gateway (RGW) , where STS session tokens are protected by an AES-128-CBC handler that provides no message authentication. An attacker holding any valid STS token can perform a CBC bit-flip on the acct_type, perm_type, and is_admin fields to forge an is_admin ...

CVE-2026-39944

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 ST...

CVE-2026-39944 Ceph: CephX AES Authentication error

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 ST...

CVE-2026-39944 Ceph: CephX AES Authentication error

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 ST...

Fedora 44 : ceph (2026-7de7d03796)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7de7d03796 advisory. Ceph 20.2.4 GA CVE-2025-30156 is an authentication bypass in CephX caused by misuse of AES-CBC...