CVE-2026-4408
9.0 CRITICALA flaw was found in Samba
Published: 2026-05-28 · Last updated: 2026-06-10
Severity and scoring
- CVSS
- 9.0 CRITICAL
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- CWE
- CWE-78
Affected products
| Vendor | Product |
|---|---|
| redhat | enterprise_linux, openshift_container_platform, samba |
| samba | enterprise_linux, openshift_container_platform, samba |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-4408
- [Other]https://access.redhat.com/errata/RHSA-2026:22644
- [Other]https://access.redhat.com/errata/RHSA-2026:22963
- [Other]https://access.redhat.com/errata/RHSA-2026:25049
- [Other]https://access.redhat.com/security/cve/CVE-2026-4408
- [Other]https://bugzilla.redhat.com/show_bug.cgi?id=2479762
- [Vendor advisory]https://bugzilla.samba.org/show_bug.cgi?id=16034
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