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[ CVE-2026-109411 · Published 28 Oct 2026 ]

Vulnerability in Samba

CVSS 8.1 EPSS <1%2 agency advisoriesFix available

[ Description ]Official description

An access control bypass flaw was identified 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 mismatched character casing, the module fails to perform a case-insensitive lookup correctly, causing the server to treat the operation as creating a new file. As a result, the server skips standard permission checks on the existing file, allowing the attacker to access or overwrite sensitive data owned by other users.

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

  • CERT-FRCERTFR-2026-AVI-1400

    Vulnerability in Samba Translated from French

    A vulnerability has been discovered in Samba. It allows an attacker to cause a breach of data confidentiality, a breach of data integrity and a security policy bypass.

    CVE-2026-109411
  • BSI CERT-BundWID-SEC-2026-4159

    Samba: Vulnerability allows bypassing security measures Translated from German

    CVE-2026-109411

[ References ]References