Bug 2537861 (CVE-2026-61821)

Summary: CVE-2026-61821 pg_partman: authorization bypass to move child tables between schemas during retention
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in pg_partman. A user with partman_user access can bypass authorization checks in the drop_partition_id and drop_partition_time functions. This allows them to move retained child tables to schemas where they typically lack CREATE privileges. The relocation is performed with elevated pg_partman_bgw.role privileges, which default to PostgreSQL superuser, resulting in unauthorized table relocation and potential privilege escalation.
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Bug Depends On: 2540729    
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Description OSIDB Bzimport 2026-09-22 15:48:41 UTC 
pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, drop_partition_id() and drop_partition_time() use part_config.retention_schema as the target for ALTER TABLE SET SCHEMA and accept any nonempty schema name. A role with partman_user access can select a target schema where the role lacks the normal CREATE privilege, and the background worker performs the relocation with pg_partman_bgw.role privileges, which default to PostgreSQL superuser, bypassing the authorization check that a normal ALTER TABLE SET SCHEMA operation would enforce. This permits unauthorized relocation of retained child tables between schemas. This issue is fixed in version 5.5.0.