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Samba: group policy certificate enrollment uses http:// without validation

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-3012
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 08:35 UTC · Revision 1

Source evidence

Samba: group policy certificate enrollment uses http:// without validation

core-osv · Original source

Published 27 May 2026, 10:02 UTC

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.

osv:CVE-2026-3012
Complete source record
{
  "id": "a3b0f92438d7061f64528c5a1acdcf590b734fb4a20e8a31dfb8017644ec9a45",
  "url": "https://osv.dev/vulnerability/CVE-2026-3012",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Samba: group policy certificate enrollment uses http:// without validation",
    "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.",
    "evidence": "osv:CVE-2026-3012",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-3012",
      "aliases": [
        "CVE-2026-3012"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/samba-team/samba",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e95d85f784ae6b19f2cb42cc9039b60b146e5b69"
                },
                {
                  "fixed": "1c7d4b5b388ae2647732ed54834d5547a8c1357a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.16.0"
                      },
                      {
                        "fixed": "4.21.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3012.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.915902225Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3012.json",
        "https://access.redhat.com/errata/RHSA-2026:22644",
        "https://access.redhat.com/errata/RHSA-2026:22963",
        "https://access.redhat.com/errata/RHSA-2026:25049",
        "https://access.redhat.com/errata/RHSA-2026:25979",
        "https://access.redhat.com/errata/RHSA-2026:28053",
        "https://access.redhat.com/errata/RHSA-2026:28054",
        "https://access.redhat.com/errata/RHSA-2026:28055",
        "https://access.redhat.com/errata/RHSA-2026:28056",
        "https://access.redhat.com/errata/RHSA-2026:28057",
        "https://access.redhat.com/errata/RHSA-2026:29863",
        "https://access.redhat.com/errata/RHSA-2026:56786",
        "https://access.redhat.com/errata/RHSA-2026:56853",
        "https://access.redhat.com/errata/RHSA-2026:56911",
        "https://access.redhat.com/errata/RHSA-2026:57483",
        "https://access.redhat.com/errata/RHSA-2026:59831",
        "https://access.redhat.com/errata/RHSA-2026:60019",
        "https://access.redhat.com/errata/RHSA-2026:62409",
        "https://access.redhat.com/errata/RHSA-2026:62549",
        "https://access.redhat.com/errata/RHSA-2026:65839",
        "https://access.redhat.com/errata/RHSA-2026:65851",
        "https://access.redhat.com/errata/RHSA-2026:65907",
        "https://access.redhat.com/errata/RHSA-2026:67857",
        "https://access.redhat.com/errata/RHSA-2026:70586",
        "https://access.redhat.com/errata/RHSA-2026:77320",
        "https://access.redhat.com/security/cve/CVE-2026-3012",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3012.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-3012",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2447319",
        "https://bugzilla.samba.org/show_bug.cgi?id=16003"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-345"
        ],
        "cna_assigner": "redhat",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0:4.23.5-109.el10_2"
                  },
                  {
                    "fixed": "0:4.21.3-114.el10_0.1"
                  },
                  {
                    "fixed": "0:4.19.4-16.el8_10"
                  },
                  {
                    "fixed": "0:4.19.4-16.el8_10"
                  },
                  {
                    "fixed": "0:4.15.5-16.el8_6.1"
                  },
                  {
                    "fixed": "0:4.15.5-16.el8_6.1"
                  },
                  {
                    "fixed": "0:4.17.5-7.el8_8.1"
                  },
                  {
                    "fixed": "0:4.17.5-7.el8_8.1"
                  },
                  {
                    "fixed": "0:4.23.5-10.el9_8"
                  },
                  {
                    "fixed": "0:4.23.5-10.el9_8"
                  },
                  {
                    "fixed": "0:4.17.5-105.el9_2.5"
                  },
                  {
                    "fixed": "0:4.19.4-105.el9_4.4"
                  },
                  {
                    "fixed": "0:4.21.3-14.el9_6.1"
                  },
                  {
                    "fixed": "412.86.202608241157-0"
                  },
                  {
                    "fixed": "412.86.202609082051-0"
                  },
                  {
                    "fixed": "413.92.202609080414-0"
                  },
                  {
                    "fixed": "413.92.202609302032-0"
                  },
                  {
                    "fixed": "414.92.202608172040-0"
                  },
                  {
                    "fixed": "414.92.202609011250-0"
                  },
                  {
                    "fixed": "415.92.202608180329-0"
                  },
                  {
                    "fixed": "415.92.202609140326-0"
                  },
                  {
                    "fixed": "416.94.202608150307-0"
                  },
                  {
                    "fixed": "416.94.202609011112-0"
                  },
                  {
                    "fixed": "417.94.202608250221-0"
                  },
                  {
                    "fixed": "417.94.202609191027-0"
                  },
                  {
                    "fixed": "418.94.202608142238-0"
                  },
                  {
                    "fixed": "418.94.202609031320-0"
                  },
                  {
                    "fixed": "4.19.9.6.202606241344-0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "InverseAffectedRanges"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3012.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-3012",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501161,
  "published_at": "2026-05-27T10:02:21.767+00:00"
}