UBUNTU-CVE-2026-50737 (CVE-2026-50737)
Vulnerability from osv_ubuntu – Published: 2026-07-28 19:17 – Updated: 2026-10-17 09:44 – Source websiteWhen applying replicated changes for a row that is missing one or more columns, pglogical evaluates the affected table's default expressions on the subscriber. Because the apply worker runs at a privilege level equivalent to a PostgreSQL superuser in default installations, any function invoked by such a default expression also runs at that privilege. A party acting as the publisher can use this path to cause functions to be executed on the subscriber as superuser, escalating from a role permitted to use pglogical to full superuser. This is a second, independent path to the same superuser escalation tracked under CVE-2026-50736 (the pglogical queue issue). To exploit the issue an attacker must be able to direct a subscription at an endpoint they control. In default installations this requires privileges normally reserved for a superuser, so the issue is most relevant to managed deployments where the ability to create subscriptions has been delegated to non-superuser roles.
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-10-pglogical",
"binary_version": "2.1.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.1.1-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.0-1",
"2.1.0-1",
"2.1.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-12-pglogical",
"binary_version": "2.3.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.3.0-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.2-1",
"2.3.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-14-pglogical",
"binary_version": "2.4.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.4.1-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.3-3",
"2.4.0-2",
"2.4.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-16-pglogical",
"binary_version": "2.4.4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.4.4-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.3-1ubuntu1",
"2.4.4-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-18-pglogical",
"binary_version": "2.4.8-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.4.8-1?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.6-2",
"2.4.7-1",
"2.4.8-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "postgresql-18-pglogical",
"binary_version": "2.4.6-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "pglogical",
"purl": "pkg:deb/ubuntu/pglogical@2.4.6-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.5-1build1",
"2.4.6-1",
"2.4.6-2"
]
}
],
"aliases": [],
"details": "When applying replicated changes for a row that is missing one or more columns, pglogical evaluates the affected table\u0027s default expressions on the subscriber. Because the apply worker runs at a privilege level equivalent to a PostgreSQL superuser in default installations, any function invoked by such a default expression also runs at that privilege. A party acting as the publisher can use this path to cause functions to be executed on the subscriber as superuser, escalating from a role permitted to use pglogical to full superuser. This is a second, independent path to the same superuser escalation tracked under CVE-2026-50736 (the pglogical queue issue). To exploit the issue an attacker must be able to direct a subscription at an endpoint they control. In default installations this requires privileges normally reserved for a superuser, so the issue is most relevant to managed deployments where the ability to create subscriptions has been delegated to non-superuser roles.",
"id": "UBUNTU-CVE-2026-50737",
"modified": "2026-10-17T09:44:22Z",
"published": "2026-07-28T19:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-50737"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-50737"
},
{
"type": "REPORT",
"url": "https://github.com/2ndQuadrant/pglogical/releases/tag/REL2_4_8"
},
{
"type": "REPORT",
"url": "https://www.enterprisedb.com/docs/security/advisories/cve202650735/"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-50737"
]
}
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