Disclosure summary
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.
Source-reported weakness categories
CWE-78
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-4408
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| redhat | openshift_container_platform | 4.0 |
| samba | samba | * {"versionStartIncluding":"4.1.0","versionEndExcluding":"4.21.0"} |
| redhat | enterprise_linux | 6.0 |
| redhat | enterprise_linux | 7.0 |
| redhat | enterprise_linux | 9.0 |
Original records & references
- NIST NVD record
- CVE Program record
- access.redhat.com — Issue Tracking
- access.redhat.com — Issue Tracking
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- access.redhat.com — Third Party Advisory
- bugzilla.redhat.com — Issue Tracking, Third Party Advisory
- bugzilla.samba.org — Issue Tracking, Vendor Advisory
- access.redhat.com — Issue Tracking
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- access.redhat.com
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- access.redhat.com
- access.redhat.com — Third Party Advisory
- bugzilla.redhat.com — Issue Tracking, Third Party Advisory
- security.access.redhat.com
PUBLISHED 2026-05-28T05:16:47-04:00
MODIFIED 2026-10-08T17:18:01-04:00
INGESTED 2026-10-10T20:50:35-04:00