ubuntu-cve-2026-43964
Vulnerability from osv_ubuntu
Published
2026-05-05 00:00
Modified
2026-06-30 16:21
Summary
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.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@2.11.0-1ubuntu1.2+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11.0-1ubuntu1.2+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.1.0-3ubuntu0.4+esm4?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.1.0-3ubuntu0.4+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.11.3-1ubuntu2",
"2.11.3-1ubuntu3",
"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 (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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.3.0-1ubuntu0.4+esm4?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.0-1ubuntu0.4+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "3.4.13-0ubuntu1.4+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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.4.13-0ubuntu1.4+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.13-0ubuntu1.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "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"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.6.4-1ubuntu1.4?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.4-1ubuntu1.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "3.8.6-1ubuntu0.1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.8.6-1ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.6-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "3.10.2-1ubuntu2.1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.10.2-1ubuntu2.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.10.2-1ubuntu2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.9.1-10ubuntu1",
"3.10.2-1ubuntu1",
"3.10.2-1ubuntu2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "postfix",
"binary_version": "3.10.6-4ubuntu2.1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "postfix",
"purl": "pkg:deb/ubuntu/postfix@3.10.6-4ubuntu2.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.10.6-4ubuntu2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.10.2-1ubuntu2",
"3.10.2-1ubuntu3",
"3.10.6-1ubuntu1",
"3.10.6-4ubuntu1",
"3.10.6-4ubuntu2"
]
}
],
"aliases": [],
"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.",
"id": "UBUNTU-CVE-2026-43964",
"modified": "2026-06-30T16:21:55Z",
"published": "2026-05-05T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-43964"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-43964"
},
{
"type": "REPORT",
"url": "https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2026/05/04/25"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8253-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8253-2"
}
],
"related": [
"USN-8253-1",
"USN-8253-2"
],
"schema_version": "1.7.0",
"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": "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"
}
],
"upstream": [
"CVE-2026-43964"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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