{"id":"UBUNTU-CVE-2026-61818","details":"pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, undo_partition() reads part_config.time_encoder as unrestricted text and interpolates it without identifier quoting into a dynamically executed SELECT statement. A role with partman_user access can store SQL rather than a function name, and the SQL executes with the privileges of the caller that invokes undo_partition(). The function is not part of the default background-worker path, which limits the automatic superuser escalation described by the related create-partition vulnerability, but a privileged caller can still have its available confidentiality, integrity, and availability permissions abused. This issue is fixed in version 5.5.0.","modified":"2026-09-21T21:39:52.522804254Z","published":"2026-09-21T00:00:00Z","upstream":["CVE-2026-61818"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-61818"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-61818"},{"type":"REPORT","url":"https://github.com/pgpartman/pg_partman/security/advisories/GHSA-fm3m-9fh7-mqfc"},{"type":"REPORT","url":"https://github.com/pgpartman/pg_partman/commit/ba9405542acf24dd881845b935cab8b165854361"},{"type":"REPORT","url":"https://github.com/pgpartman/pg_partman/releases/tag/v5.5.0"}],"affected":[{"package":{"name":"pg-partman","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.2-1","2.2.2-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.2-2","binary_name":"postgresql-9.5-partman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}},{"package":{"name":"pg-partman","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.3-1","3.1.0-1","3.1.1-1","3.1.2-1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.2-1","binary_name":"postgresql-10-partman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}},{"package":{"name":"pg-partman","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1","4.2.0-1","4.2.2-1","4.3.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-12-partman","binary_version":"4.3.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}},{"package":{"name":"pg-partman","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1-1","4.6.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-14-partman","binary_version":"4.6.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}},{"package":{"name":"pg-partman","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.3-1","5.0.0-2","5.0.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-16-partman","binary_version":"5.0.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}},{"package":{"name":"pg-partman","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/pg-partman?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.4-1","5.3.1-2","5.4.0-1","5.4.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"postgresql-18-partman","binary_version":"5.4.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61818.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}