OS Command Injection Affecting samba-libs package, versions <0:4.10.16-26.el7_9.1


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
2.5% (83rd percentile)

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  • Snyk IDSNYK-RHEL7-SAMBALIBS-17428882
  • published23 Jun 2026
  • disclosed26 May 2026

Introduced: 26 May 2026

CVE-2026-4408  (opens in a new tab)
CWE-78  (opens in a new tab)

How to fix?

Upgrade RHEL:7 samba-libs to version 0:4.10.16-26.el7_9.1 or higher.
This issue was patched in RHSA-2026:28132.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba-libs package and not the samba-libs package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1