pgpartman pg_partman up to 5.4.x Background Worker drop_partition_id/drop_partition_time privileges management

Summaryinfo

A vulnerability identified as problematic has been detected in pgpartman pg_partman up to 5.4.x. This vulnerability affects the function drop_partition_id/drop_partition_time of the component Background Worker. This manipulation causes privileges management. This vulnerability appears as CVE-2026-61821. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in pgpartman pg_partman up to 5.4.x. Affected by this vulnerability is the function drop_partition_id/drop_partition_time of the component Background Worker. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-61821 since 07/10/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 5.5.0 eliminates this vulnerability.

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Productinfo

Vendor

• pgpartman

Name

• pg_partman

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4

Website

• Product: https://github.com/pgpartman/pg_partman/

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