USN-8253-2

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Source
https://ubuntu.com/security/notices/USN-8253-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-2.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8253-2
Upstream
Related
Published
2026-06-03T20:22:56Z
Modified
2026-06-10T01:29:11.853676174Z
Summary
postfix vulnerability
Details

USN-8253-1 fixed a vulnerability in Postfix. This update provides the corresponding fix for Postfix on Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

Kamil Frankowicz discovered that Postfix incorrectly handled certain enhanced status codes. A remote attacker could possibly use this issue to cause Postfix to crash, resulting in a denial of service.

References

Affected packages

Ubuntu:Pro:14.04:LTS / postfix

Package

Name
postfix
Purl
pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.11.0-1ubuntu1.2+esm4

Affected versions

2.*
2.10.2-1
2.10.2-1build1
2.11.0-1
2.11.0-1ubuntu1
2.11.0-1ubuntu1.2
2.11.0-1ubuntu1.2+esm2
2.11.0-1ubuntu1.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "2.11.0-1ubuntu1.2+esm4"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:14.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-43964",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-2.json"

Ubuntu:Pro:16.04:LTS / postfix

Package

Name
postfix
Purl
pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.1.0-3ubuntu0.4+esm4

Affected versions

2.*
2.11.3-1ubuntu2
2.11.3-1ubuntu3
3.*
3.0.4-1ubuntu1
3.0.4-2
3.0.4-3
3.0.4-5
3.0.4-5build1
3.1.0-3
3.1.0-3ubuntu0.1
3.1.0-3ubuntu0.2
3.1.0-3ubuntu0.3
3.1.0-3ubuntu0.4
3.1.0-3ubuntu0.4+esm2
3.1.0-3ubuntu0.4+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.1.0-3ubuntu0.4+esm4"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-43964",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-2.json"

Ubuntu:Pro:18.04:LTS / postfix

Package

Name
postfix
Purl
pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.3.0-1ubuntu0.4+esm4

Affected versions

3.*
3.2.3-1
3.2.3-1build1
3.2.4-1
3.2.5-1
3.2.5-1build1
3.3.0-1
3.3.0-1ubuntu0.1
3.3.0-1ubuntu0.2
3.3.0-1ubuntu0.3
3.3.0-1ubuntu0.4
3.3.0-1ubuntu0.4+esm2
3.3.0-1ubuntu0.4+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.3.0-1ubuntu0.4+esm4"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-43964",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-2.json"

Ubuntu:Pro:20.04:LTS / postfix

Package

Name
postfix
Purl
pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.4.13-0ubuntu1.4+esm1

Affected versions

3.*
3.4.5-1ubuntu1
3.4.7-1
3.4.7-2
3.4.8-1
3.4.9-1
3.4.10-1
3.4.10-1ubuntu1
3.4.13-0ubuntu1
3.4.13-0ubuntu1.1
3.4.13-0ubuntu1.2
3.4.13-0ubuntu1.3
3.4.13-0ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.4.13-0ubuntu1.4+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-43964",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-2.json"