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CVE

CVE-2026-4408

Samba: remote code execution in samr
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CVE

CVE-2026-4408

Samba: remote code execution in samr

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/downloads/content/package-browser/, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4408.json, https://access.redhat.com/errata/RHSA-2026:22644, https://access.redhat.com/errata/RHSA-2026:22963, https://access.redhat.com/errata/RHSA-2026:25049, https://access.redhat.com/errata/RHSA-2026:25979, https://access.redhat.com/errata/RHSA-2026:28053, https://access.redhat.com/errata/RHSA-2026:28054, https://access.redhat.com/errata/RHSA-2026:28055, https://access.redhat.com/errata/RHSA-2026:28056, https://access.redhat.com/errata/RHSA-2026:28057, https://access.redhat.com/errata/RHSA-2026:28058, https://access.redhat.com/errata/RHSA-2026:28132, https://access.redhat.com/errata/RHSA-2026:29799, https://access.redhat.com/errata/RHSA-2026:29833, https://access.redhat.com/errata/RHSA-2026:29863, https://access.redhat.com/security/cve/CVE-2026-4408, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4408.json, https://nvd.nist.gov/vuln/detail/CVE-2026-4408, https://bugzilla.redhat.com/showbug.cgi?id=2479762, https://bugzilla.samba.org/showbug.cgi?id=16034

Severity

9

CVSS Score
0
10

Basic Information

Base CVSS
9
EPSS Probability
0.02501%
EPSS Percentile
0.83464%
Introduced Version
a6fb418be7adccdd583a3b489b58023cfdd392ef,0,4.1.0
Fix Available
1c7d4b5b388ae2647732ed54834d5547a8c1357a,0:4.23.5-10.el9_8,0:4.19.4-16.el8_10,2:4.17.12+dfsg-0+deb12u4,2:4.13.13+dfsg-1~deb11u8,2:4.22.8+dfsg-0+deb13u2,2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2,2:4.19.5+dfsg-4ubuntu9.6,2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6,2:4.15.13+dfsg-0ubuntu1.12,4.21.0,4.22.10-r0,0:4.10.16-25.0.11.el7_9,0:4.19.4-16.0.1.el8_10,0:4.10.16-24.amzn2.0.7,2:4.17.12-1.amzn2023.0.4

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