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CVE-2026-4408 Details

Description

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA: redhat-SADPCVSS-B:9 CRITICALVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:22644 redhat-SADPIssue Tracking
https://access.redhat.com/errata/RHSA-2026:22963 redhat-SADPIssue Tracking
https://access.redhat.com/errata/RHSA-2026:25049 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:25979 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:28053 redhat-SADP

see all 48 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')redhat-SADP
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')[email protected]

Affected Products

ProductVersions
redhat openshift container platform
4.0

CPE

  • cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
samba samba
>= 4.1.0, < 4.21.0

CPE

  • cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat enterprise linux
6.0
7.0
9.0

CPE

  • cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

39 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-4408
NVD Published Date:
May 28, 2026
NVD Last Modified:
Sep 18, 2026
Source:
[email protected]
CVE-2026-4408 Details - Not Deferred