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Vulnerabilities

Vulnerability · CVE-2026-4408

A flaw was found in Samba.

Published May 28, 2026 · catalog updated Oct 8, 2026 · openshift container platform

Check if you run it

No confirmed exploitation is on record for CVE-2026-4408. EPSS is 1.75%. Act only if a listed version of openshift container platform is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.75%
Remediation
Not established
Affected products
cpe redhat/enterprise linux · cpe redhat/openshift container platform · cpe samba/samba

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/enterprise linux6.0
  • cpe redhat/enterprise linux7.0
  • cpe redhat/enterprise linux9.0
  • cpe redhat/openshift container platform4.0
  • cpe samba/sambaversion unspecified

How to fix CVE-2026-4408

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4408. EPSS is 1.75%. Act only if a listed version of openshift container platform is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 6.0; redhat/enterprise linux 7.0; redhat/enterprise linux 9.0; redhat/openshift container platform 4.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 1.75%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Kubernetes security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 28, 2026 · NIST NVD

    Detected

    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 execu

  2. Oct 8, 2026 · NIST NVD

    Updated

    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 execu

Sources

  • CVE.orgVulnerability recordCVE-2026-4408

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4408

    30-day exploitation probability 1.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4408

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.