CVE-2026-4408Samba: remote code execution in samr
Updated under an hour ago ()
Does this affect you?
It affects Red Hat Enterprise Linux 10 and 10 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-78
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:4.23.5-109.el10_2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:4.21.3-114.el10_0.1 not affected | CNA record |
from 0:4.10.16-26.el7_9.1 not affected | CNA record | |
from 0:4.13.3-12.el8_4.1 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life | from 0:4.13.3-12.el8_4.1 not affected | CNA record |
from 0:4.17.5-7.el8_8.1 not affected | CNA record | |
from 0:4.17.5-7.el8_8.1 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:4.21.3-14.el9_6.1 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:4.23.5-109.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:4.21.3-114.el10_0.1 not affected | CISA ADP |
from 0:4.10.16-26.el7_9.1 not affected | CISA ADP | |
from 0:4.13.3-12.el8_4.1 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:4.13.3-12.el8_4.1 not affected | CISA ADP |
from 0:4.17.5-7.el8_8.1 not affected | CISA ADP | |
from 0:4.17.5-7.el8_8.1 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:4.21.3-14.el9_6.1 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CISA ADP |
redhat openshift_container_platform redhat:openshift_container_platform | 4.0 | NVD |
samba samba samba:samba | from 4.1.0 before 4.21.0 | NVD |
redhat enterprise_linux redhat:enterprise_linux | 6.0; 7.0; 9.0 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:22644vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:22963vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:25049vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:25979vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28053vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28054vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28055vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28056vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28057vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28058vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:28132vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29799vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29833vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29863vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56786vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56853vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:56911vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:57483vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59831vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:60019vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:65839vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-4408vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2479762issue-tracking, x-refsource-redhat
- https://bugzilla.samba.org/show_bug.cgi?id=16034
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.