CVE-2026-4408

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Source
https://cve.org/CVERecord?id=CVE-2026-4408
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-4408.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-4408
Downstream
Related
Published
2026-05-28T07:25:27.169Z
Modified
2026-06-11T04:01:45.370612323Z
Severity
  • 9.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Samba: remote code execution in samr
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4408.json",
    "cwe_ids": [
        "CWE-78"
    ],
    "cna_assigner": "redhat"
}
References

Affected packages

Git / github.com/samba-team/samba

Affected ranges

Type
GIT
Repo
https://github.com/samba-team/samba
Events
Introduced
a6fb418be7adccdd583a3b489b58023cfdd392ef
Fixed
1c7d4b5b388ae2647732ed54834d5547a8c1357a
Database specific 
{
    "extracted_events": [
        {
            "introduced": "4.1.0"
        },
        {
            "fixed": "4.21.0"
        }
    ],
    "cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-4408.json"