CVE-2026-4408 (GCVE-0-2026-4408)

Vulnerability from cvelistv5 – Published: 2026-05-28 07:25 – Updated: 2026-06-30 17:34
VLAI
Title
Samba: remote code execution in samr
Summary
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.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:4.23.5-109.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:4.21.3-114.el10_0.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:4.10.16-26.el7_9.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:7::server
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.19.4-16.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
    cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:4.13.3-12.el8_4.1 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:4.13.3-12.el8_4.1 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.15.5-16.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.15.5-16.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.17.5-7.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.17.5-7.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:4.23.5-10.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/a:redhat:enterprise_linux:9::resilientstorage
    cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:4.17.5-105.el9_2.5 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
    cpe:/o:redhat:rhel_e4s:9.2::baseos
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:4.19.4-105.el9_4.4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4::appstream
    cpe:/a:redhat:rhel_e4s:9.4::resilientstorage
    cpe:/o:redhat:rhel_e4s:9.4::baseos
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:4.21.3-14.el9_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/a:redhat:rhel_eus:9.6::crb
    cpe:/a:redhat:rhel_eus:9.6::resilientstorage
    cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat OpenShift Container Platform 4.20 Unaffected: 4.20.9.6.202606241928-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.20::el9
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Red Hat Red Hat OpenShift Container Platform 4.21 Unaffected: 4.21.9.6.202606241859-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux Server (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux Server ResilientStorage (v. 7 ELS)     cpe:/o:redhat:enterprise_linux:7::server
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Red Hat Red Hat Enterprise Linux Server Optional (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat OpenShift Container Platform 4.21     cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.6)     cpe:/a:redhat:rhel_aus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)     cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.8)     cpe:/a:redhat:rhel_e4s:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.8)     cpe:/a:redhat:rhel_tus:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS (v. 8)     cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.4)     cpe:/o:redhat:rhel_aus:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)     cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.6)     cpe:/o:redhat:rhel_aus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)     cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.8)     cpe:/o:redhat:rhel_e4s:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.8)     cpe:/o:redhat:rhel_tus:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.2)     cpe:/o:redhat:rhel_e4s:9.2::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.4)     cpe:/o:redhat:rhel_e4s:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux CRB (v. 8)     cpe:/a:redhat:enterprise_linux:8::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Enterprise Linux Resilient Storage E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
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Red Hat Red Hat Enterprise Linux Resilient Storage E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::resilientstorage
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Red Hat Red Hat Enterprise Linux Resilient Storage EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::resilientstorage
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Red Hat Red Hat Enterprise Linux Resilient Storage (v. 9)     cpe:/a:redhat:enterprise_linux:9::resilientstorage
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Date Public
2026-05-26 00:00
Credits
Red Hat would like to thank John Walker (ZeroPath) and Ron Ben Yizhak (SafeBreach) for reporting this issue.
Show details on NVD website

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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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