cve-2026-4408
CRITICAL CVSS 9.0 nvd
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.
Timeline
- Published
- 2026-05-28
- Last Modified
- 2026-09-18
CVSS Details
- Attack Vector
- NETWORK
- Attack Complexity
- HIGH
- Privileges Required
- NONE
Affected Products
- redhat openshift_container_platform
- samba samba
- redhat enterprise_linux
Weaknesses (CWE)
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 9.0 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
2.2 | 6.0 | secalert@redhat.com |
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9 | 5.9 | nvd@nist.gov |
| 3.1 | 9.0 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
2.2 | 6.0 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* |
>= 4.1.0, < 4.21.0 | yes |
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:22644 Issue Tracking
- https://access.redhat.com/errata/RHSA-2026:22963 Issue Tracking
- https://access.redhat.com/errata/RHSA-2026:25049
- https://access.redhat.com/errata/RHSA-2026:25979
- https://access.redhat.com/errata/RHSA-2026:28053
- https://access.redhat.com/errata/RHSA-2026:28054
- https://access.redhat.com/errata/RHSA-2026:28055
- https://access.redhat.com/errata/RHSA-2026:28056
- https://access.redhat.com/errata/RHSA-2026:28057
- https://access.redhat.com/errata/RHSA-2026:28058
- https://access.redhat.com/errata/RHSA-2026:28132
- https://access.redhat.com/errata/RHSA-2026:29799
- https://access.redhat.com/errata/RHSA-2026:29833
- https://access.redhat.com/errata/RHSA-2026:29863
- https://access.redhat.com/errata/RHSA-2026:56786
- https://access.redhat.com/errata/RHSA-2026:56853
- https://access.redhat.com/errata/RHSA-2026:56911
- https://access.redhat.com/errata/RHSA-2026:57483
- https://access.redhat.com/errata/RHSA-2026:59831
- https://access.redhat.com/errata/RHSA-2026:60019
- https://access.redhat.com/errata/RHSA-2026:65839
- https://access.redhat.com/security/cve/CVE-2026-4408 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2479762 Issue Tracking, Third Party Advisory
- https://bugzilla.samba.org/show_bug.cgi?id=16034 Issue Tracking, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4408.json
Linked Vulnerabilities
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"dateUpdated": "2026-09-18T13:18:31.373",
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"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4408.json"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-78"
}
],
"source": "secalert@redhat.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-78"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
},
"severity": "CRITICAL",
"source": "nvd",
"title": "A flaw was found in Samba"
}