CVE-2026-3012 (GCVE-0-2026-3012)
Vulnerability from cvelistv5
Published
2026-05-27 10:02
Modified
2026-08-27 12:04
Severity ?
8.0 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
Summary
A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.
References
https://access.redhat.com/errata/RHSA-2026:22644 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22963 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25049 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25979 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28053 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28054 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28055 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28056 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28057 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29863 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57483 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-3012 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447319 issue-tracking, x_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=16003
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:4.23.5-109.el10_2   < *
    cpe:/o:redhat:enterprise_linux:10.2
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:4.21.3-114.el10_0.1   < *
    cpe:/o:redhat:enterprise_linux_eus:10.0
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.19.4-16.el8_10   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.19.4-16.el8_10   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.15.5-16.el8_6.1   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.15.5-16.el8_6.1   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.17.5-7.el8_8.1   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.17.5-7.el8_8.1   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:4.23.5-10.el9_8   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:4.23.5-10.el9_8   < *
    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
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:4.17.5-105.el9_2.5   < *
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
    cpe:/o:redhat:rhel_e4s:9.2::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:4.19.4-105.el9_4.4   < *
    cpe:/a:redhat:rhel_e4s:9.4::appstream
    cpe:/a:redhat:rhel_e4s:9.4::resilientstorage
    cpe:/o:redhat:rhel_e4s:9.4::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:4.21.3-14.el9_6.1   < *
    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
 Create a notification for this product.
   Red Hat Red Hat OpenShift Container Platform 4.18 Unaffected: 418.94.202608142238-0   < *
    cpe:/a:redhat:openshift:4.18::el9
 Create a notification for this product.
   Red Hat Red Hat OpenShift Container Platform 4.19 Unaffected: 4.19.9.6.202606241344-0   < *
    cpe:/a:redhat:openshift:4.19::el9
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
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\"https://bugzilla.samba.org/show_bug.cgi?id=16003\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Systems are not affected unless Samba Group Policy processing and certificate auto-enrollment are explicitly enabled.\\n\\nAdministrators can reduce exposure by:\\n\\nAvoiding unnecessary use of certificate auto-enrollment.\\nEnsuring your \\\"smb.conf\\\" does not contain a line like ```apply group policies = yes```. If , group policy is not be enabled, the vulnerable code will not run.\\n\\nIntercepting the HTTP request requires some control over the local network or other devices to intercept or redirect traffic. Some network administrators might assess this as a low risk on their\\nnetworks.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in Samba\\u2019s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-345\", \"description\": \"Insufficient Verification of Data Authenticity\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-08-26T15:57:47.764Z\"}, \"x_redhatCweChain\": \"CWE-345: Insufficient Verification of Data Authenticity\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3012\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-26T15:57:47.764Z\", \"dateReserved\": \"2026-02-23T07:08:58.479Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-05-27T10:02:21.767Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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