OS Command Injection Affecting samba-test-libs package, versions <0:4.10.16-24.amzn2.0.7


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
1.75% (77th percentile)

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  • Snyk IDSNYK-AMZN2-SAMBATESTLIBS-17883676
  • published8 Jul 2026
  • disclosed28 May 2026

Introduced: 28 May 2026

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

How to fix?

Upgrade Amazon-Linux:2 samba-test-libs to version 0:4.10.16-24.amzn2.0.7 or higher.
This issue was patched in ALAS2-2026-3493.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba-test-libs package and not the samba-test-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 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