Samba samba-dcerpcd Service os command injection

Summaryinfo

A vulnerability was found in Samba and classified as critical. This affects an unknown function of the component samba-dcerpcd Service. Executing a manipulation can lead to os command injection. This vulnerability appears as CVE-2026-4408. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Samba (the affected version is unknown). It has been declared as critical. This vulnerability affects an unknown code of the component samba-dcerpcd Service. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-4408 since 03/18/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/23/2026). The MITRE ATT&CK project declares the attack technique as T1202.

The vulnerability scanner Nessus provides a plugin with the ID 316852 (Linux Distros Unpatched Vulnerability : CVE-2026-4408), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (316852) and EUVD (EUVD-2026-32741). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• File Transfer Software

Name

• Samba

License

• open-source

Website

• Product: https://www.samba.org/

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Once again VulDB remains the best source for vulnerability data.

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