Riskcovery

CVE-2026-4408

Samba: remote code execution in samr

State
Published
Severity
9.0 Critical
Published
May 28, 2026
Updated
Oct 8, 2026
Reserved
Mar 18, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.19.0 CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hredhat
3.19.0 CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

ProductVersions
Red Hat Enterprise Linux 10Red Hat
  • 0:4.23.5-109.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat
  • 0:4.21.3-114.el10_0.1 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat
  • 0:4.10.16-26.el7_9.1 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat
  • 0:4.10.16-26.el7_9.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:4.19.4-16.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:4.19.4-16.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 0:4.13.3-12.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.13.3-12.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat
  • 0:4.15.5-16.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.15.5-16.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 0:4.17.5-7.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 0:4.17.5-7.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:4.23.5-10.el9_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:4.23.5-10.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat
  • 0:4.17.5-105.el9_2.5 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat
  • 0:4.19.4-105.el9_4.4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat
  • 0:4.21.3-14.el9_6.1 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat
  • 412.86.202608241157-0 and laterNot affected
Red Hat OpenShift Container Platform 4.13Red Hat
  • 413.92.202609080414-0 and laterNot affected
Red Hat OpenShift Container Platform 4.14Red Hat
  • 414.92.202608172040-0 and laterNot affected
Red Hat OpenShift Container Platform 4.15Red Hat
  • 415.92.202608180329-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat
  • 416.94.202608150307-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat
  • 417.94.202608250221-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat
  • 418.94.202608142238-0 and laterNot affected
Red Hat OpenShift Container Platform 4.19Red Hat
  • 4.19.9.6.202606241344-0 and laterNot affected
Red Hat OpenShift Container Platform 4.20Red Hat
  • 4.20.9.6.202606241928-0 and laterNot affected
Red Hat OpenShift Container Platform 4.21Red Hat
  • 4.21.9.6.202606241859-0 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
    Red Hat Enterprise Linux 6Red Hat

      References

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