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Echo: samba: security update to 2:4.22.8+dfsg-0+deb13u2

critical Tenable Self-Hosted Container Security Plugin ID 464926

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-4408)

Solution

Update the samba library and its related packages to version 2:4.22.8+dfsg-0+deb13u2 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-4408

Plugin Details

Severity: Critical

ID: 464926

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.35

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-4408

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/26/2026

Vulnerability Publication Date: 5/28/2026

Reference Information

CVE: CVE-2026-4408

IAVA: 2026-A-0510-S