{"id":"UBUNTU-CVE-2026-61817","details":"pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, run_maintenance(), show_partitions(), show_partition_info(), undo_partition(), and partition_data_time() interpolate the writable part_config.time_dncoder text value without identifier quoting into dynamic SQL. A role with the documented partman_user privileges can store SQL rather than a decoder function name. When an affected operation later uses the poisoned value, including pg_partman_bgw maintenance for a text- or UUID-keyed set, the SQL executes with the operation's privileges, which can be the default PostgreSQL superuser background-worker role. The persistent row can restore elevated access on later ticks, and successful exploitation can permit database-wide compromise and operating-system command execution as the PostgreSQL service account. This issue is fixed in version 5.5.0.","modified":"2026-09-21T21:39:52.422216677Z","published":"2026-09-21T00:00:00Z","upstream":["CVE-2026-61817"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-61817"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-61817"},{"type":"REPORT","url":"https://github.com/pgpartman/pg_partman/security/advisories/GHSA-gmw2-52wc-258g"},{"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_name":"postgresql-9.5-partman","binary_version":"2.2.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61817.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_name":"postgresql-10-partman","binary_version":"3.1.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61817.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-2026-61817.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_version":"4.6.0-1","binary_name":"postgresql-14-partman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61817.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-2026-61817.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-2026-61817.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"}]}