VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 9.0 criticalEPSS 46.9% probability of exploitation in 30 days
Red Hat

CVE-2026-4408: Samba: remote code execution in samr

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
46.9%

Up from 2.5% on .

EPSS score, percentile 98.8 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.0 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (12)

Which versions are affected?

Unaffected 0:4.23.5-109.el10_2; 0:4.21.3-114.el10_0.1; 0:4.10.16-26.el7_9.1; 0:4.10.16-26.el7_9.1; 0:4.19.4-16.el8_10; 0:4.19.4-16.el8_10; and 14 more

Versions by product

Source: CISA KEV 2026.11.10, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

Workaround (from the CVE record)

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (20 products)
Red Hat Red Hat Enterprise Linux 10
StatusVersions
Unaffected0:4.23.5-109.el10_2

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
StatusVersions
Unaffected0:4.21.3-114.el10_0.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
StatusVersions
Unaffected0:4.10.16-26.el7_9.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
StatusVersions
Unaffected0:4.10.16-26.el7_9.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
StatusVersions
Unaffected0:4.19.4-16.el8_10

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
StatusVersions
Unaffected0:4.19.4-16.el8_10

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
StatusVersions
Unaffected0:4.13.3-12.el8_4.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
StatusVersions
Unaffected0:4.13.3-12.el8_4.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
StatusVersions
Unaffected0:4.15.5-16.el8_6.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
StatusVersions
Unaffected0:4.15.5-16.el8_6.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
StatusVersions
Unaffected0:4.17.5-7.el8_8.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
StatusVersions
Unaffected0:4.17.5-7.el8_8.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
StatusVersions
Unaffected0:4.23.5-10.el9_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
StatusVersions
Unaffected0:4.23.5-10.el9_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
StatusVersions
Unaffected0:4.17.5-105.el9_2.5

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
StatusVersions
Unaffected0:4.19.4-105.el9_4.4

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
StatusVersions
Unaffected0:4.21.3-14.el9_6.1

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4.12
StatusVersions
Unaffected412.86.202608241157-0

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4.13
StatusVersions
Unaffected413.92.202609080414-0

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4.14
StatusVersions
Unaffected414.92.202608172040-0

Versions not listed are: affected.

Versions the record lists as unaffected: 0:4.23.5-109.el10_2, 0:4.21.3-114.el10_0.1, 0:4.10.16-26.el7_9.1, 0:4.19.4-16.el8_10, 0:4.13.3-12.el8_4.1, 0:4.15.5-16.el8_6.1, 0:4.17.5-7.el8_8.1, 0:4.23.5-10.el9_8.

Source: CVE List, as of . About the data.

Weakness

CWE-78

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

12

    12 more in the CVE record.

    Known exploited Red Hat vulnerabilities

    • CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added )
    • CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added )
    • CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added )
    • CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added )
    • CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added )