{"id":"UBUNTU-CVE-2026-50737","details":"When 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.","modified":"2026-08-26T12:15:03.988269337Z","published":"2026-07-28T19:17:00Z","upstream":["CVE-2026-50737"],"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/"}],"affected":[{"package":{"name":"pglogical","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/pglogical?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0-1","2.1.0-1","2.1.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-10-pglogical","binary_version":"2.1.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50737.json"}},{"package":{"name":"pglogical","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/pglogical?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.2-1","2.3.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.0-1","binary_name":"postgresql-12-pglogical"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50737.json"}},{"package":{"name":"pglogical","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pglogical?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.3-3","2.4.0-2","2.4.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-14-pglogical","binary_version":"2.4.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50737.json"}},{"package":{"name":"pglogical","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pglogical?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3-1ubuntu1","2.4.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-16-pglogical","binary_version":"2.4.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50737.json"}},{"package":{"name":"pglogical","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/pglogical?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.5-1build1","2.4.6-1","2.4.6-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.6-2","binary_name":"postgresql-18-pglogical"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50737.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}