PT-2026-43448 · Samba+2 · Samba+2

Published 2026-05-26 · Updated 2026-06-03 · CVE-2026-4408

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Samba (affected versions not specified)

Description A flaw in the DCE/RPC SAMR server allows a remote attacker to achieve remote command execution on affected systems. The issue occurs in non-standard configurations of Samba file servers and classic domain controllers that utilize the "check password script" feature. When this script is configured using the %u substitution character, the client-controlled username is passed to the shell without proper escaping of meta-characters. This is particularly critical when the samba-dcerpcd service is running as a system service.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

ALSA-2026:22644

ALSA-2026:22963

BDU:2026-07316

CVE-2026-4408

OPENSUSE-SU-2026:10884-1

USN-8306-1

Affected Products

Linuxmint

Samba

Ubuntu

References · 50

• https://security-tracker.debian.org/tracker/CVE-2026-4408 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2340 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:22644 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:22644 · Vendor Advisory
• https://errata.almalinux.org/10/ALSA-2026-22963.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4408 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4408 · Security Note
• https://linux.oracle.com/errata/ELSA-2026-22644.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10884-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3012 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8306-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4480 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-1933 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:22963 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4408 · Security Note