It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1895 advisory.

    unauthenticated udp packet crashes AD DC nbt server (CVE-2026-3238)

    Samba file servers and classic (non-AD) domain controllers offer theSamValidatePasswordChange and     SamValidatePasswordReset RPC services on theSAMR DCE/RPC service when running over NCACN_IP_TCP. Both     services pass ausername and password to the check password script that can be configuredin smb.conf.

    If the check password script is configured with the %usubstitution character, the client-controlled     username is passed tothe check password script without escaping shell meta-characters,leading to a     remote command execution vulnerability.

    This is a non-standard configuration in several ways:

    It affects Samba file servers and classic (non-AD) domain controllersthat have the check password script     configured with the %usubstitution character. Active Directory Domain Controllers are notaffected, they do     not expand the username via the %u substitutioncharacter.

    The problem is much less dangerous if %u has single quotes directlyaround it, e.g. '%u', but it's still     possible to injectcommand line options.

    Standard Samba file servers and classic domain controllers are alsoonly affected if the samba-dcerpcd     service is started as a systemservice, which can only happen if rpc start on demand helpers is setto the     non-default setting no. In the default configuration forDCE/RPC, smbd starts the samba-dcerpcd in a way     that makes thevulnerable code inaccessible. (CVE-2026-4408)

    Samba passes the client-controlled job description string to thecommand configured with the print     command setting via the %Jsubstitution character without escaping shell meta characters. Thisleads to a     remote code execution vulnerability.

    Print servers configured with printing = cups or printing =iprint, and print servers that do not have     the %J substitutioncharacter in the print command setting are not affected.

    The problem is much less dangerous if %J has single quotes directlyaround it, e.g. '%J', but it's still     possible to injectcommand line options.

    By default, print servers allow guest users to print. (CVE-2026-4480)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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Amazon Linux 2023 : libnetapi, libnetapi-devel, libsmbclient (ALAS2023-2026-1895)

critical Nessus Plugin ID 322015

Version 1.2

Version 1.1

Version 1.2 Sep 28, 2026, 1:11 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:F/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:F/RL:O/RC:C") Exploit attributes ("Exploit framework core" set to "True") Plugin Feed: 202609281311
Version 1.1 Jun 23, 2026, 6:18 AM New Plugin Feed: 202606230618