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CVE-2026-4408

CriticalPublished

Samba: remote code execution in samr

Published: May 28, 2026
Updated: Sep 18, 2026
Assigning CNA: redhat
Evidence observed: Aug 5, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

2.5%

Low · next 30 days

Percentile: 83.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

ForgottenButNotGonePoC
proof-of-concept scripts for 2 unauthenticated RCEs in Samba (CVE-2026-4408 & CVE-2026-4480) and local privilege escalation in TelnetD (CVE-2026-28372)

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