UBUNTU-CVE-2026-43964

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Source
https://ubuntu.com/security/CVE-2026-43964
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-43964
Upstream
  • CVE-2026-43964
Downstream
Related
Published
2026-05-05T00:00:00Z
Modified
2026-06-10T01:29:29.571125829Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.

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/cve/2026/UBUNTU-CVE-2026-43964.json"
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/cve/2026/UBUNTU-CVE-2026-43964.json"
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/cve/2026/UBUNTU-CVE-2026-43964.json"
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/cve/2026/UBUNTU-CVE-2026-43964.json"
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 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.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 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.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 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"