USN-8253-1

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Source
https://ubuntu.com/security/notices/USN-8253-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8253-1
Upstream
Related
Published
2026-05-07T14:31:25Z
Modified
2026-05-20T16:06:19.488135641Z
Summary
postfix vulnerability
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:22.04:LTS / postfix

Package

Name
postfix
Purl
pkg:deb/ubuntu/postfix?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.6.4-1ubuntu1.4

Affected versions

3.*
3.5.6-1ubuntu2
3.5.13-1ubuntu1
3.5.13-1ubuntu2
3.5.13-1ubuntu3
3.6.3-4ubuntu1
3.6.3-5ubuntu1
3.6.3-5ubuntu2
3.6.4-1ubuntu1
3.6.4-1ubuntu1.1
3.6.4-1ubuntu1.2
3.6.4-1ubuntu1.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.6.4-1ubuntu1.4"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.6.4-1ubuntu1.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:22.04: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"
                }
            ]
        }
    ]
}

Ubuntu:24.04:LTS / postfix

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.6-1ubuntu0.1

Affected versions

3.*
3.8.1-2
3.8.2-1
3.8.3-1
3.8.4-1
3.8.5-1
3.8.6-1
3.8.6-1build1
3.8.6-1build2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.8.6-1ubuntu0.1"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.8.6-1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:24.04: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"
                }
            ]
        }
    ]
}

Ubuntu:25.10 / postfix

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.10.2-1ubuntu2.1

Affected versions

3.*
3.9.1-10ubuntu1
3.10.2-1ubuntu1
3.10.2-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-mongodb",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.10.2-1ubuntu2.1"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.10.2-1ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:25.10",
    "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"
                }
            ]
        }
    ]
}

Ubuntu:26.04:LTS / postfix

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.10.6-4ubuntu2.1

Affected versions

3.*
3.10.2-1ubuntu2
3.10.2-1ubuntu3
3.10.6-1ubuntu1
3.10.6-4ubuntu1
3.10.6-4ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "postfix",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-cdb",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-ldap",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-mongodb",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-mysql",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-pcre",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.10.6-4ubuntu2.1"
        },
        {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.10.6-4ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8253-1.json"
cves_map 
{
    "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"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}