UBUNTU-CVE-2026-3012

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Source

https://ubuntu.com/security/CVE-2026-3012

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3012.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-3012

Upstream

CVE-2026-3012

Downstream

USN-8306-1

Related

USN-8306-1

Published

2026-05-26T00:00:00Z

Modified

2026-06-09T21:19:10.511144086Z

Severity

8.0 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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

Affected packages

Ubuntu:24.04:LTS / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.19.5+dfsg-4ubuntu9.6

Affected versions

2:4.*

2:4.18.6+dfsg-1ubuntu2

2:4.18.6+dfsg-1ubuntu2.1

2:4.18.6+dfsg-1ubuntu2.2

2:4.19.4+dfsg-3ubuntu1

2:4.19.5+dfsg-1ubuntu1

2:4.19.5+dfsg-4ubuntu7

2:4.19.5+dfsg-4ubuntu8

2:4.19.5+dfsg-4ubuntu9

2:4.19.5+dfsg-4ubuntu9.2

2:4.19.5+dfsg-4ubuntu9.3

2:4.19.5+dfsg-4ubuntu9.4

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3012.json"

Ubuntu:25.10 / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.22.3+dfsg-4ubuntu2.4

Affected versions

2:4.*

2:4.21.4+dfsg-1ubuntu3

2:4.21.4+dfsg-1ubuntu4

2:4.21.4+dfsg-1ubuntu5

2:4.22.2+dfsg-1ubuntu1

2:4.22.3+dfsg-4ubuntu1

2:4.22.3+dfsg-4ubuntu2

2:4.22.3+dfsg-4ubuntu2.1

2:4.22.3+dfsg-4ubuntu2.2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.2+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3012.json"

Ubuntu:26.04:LTS / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.23.6+dfsg-1ubuntu2.1

Affected versions

2:4.*

2:4.22.3+dfsg-4ubuntu2

2:4.22.3+dfsg-4ubuntu2.1

2:4.22.3+dfsg-4ubuntu3

2:4.22.3+dfsg-4ubuntu4

2:4.23.4+dfsg-1ubuntu1

2:4.23.5+dfsg-1ubuntu2

2:4.23.6+dfsg-1ubuntu1

2:4.23.6+dfsg-1ubuntu2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.17.1+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3012.json"