Bug 2537989 (CVE-2026-61822)

Summary: CVE-2026-61822 pg_partman: disable maintenance for all partition sets
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
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 exploit an exception handling issue in the run_maintenance function. By crafting a failing partition set with a low maintenance order, an attacker can cause the maintenance process to prematurely terminate. This leads to a denial of service for partition management operations, preventing automated maintenance across the entire database.
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Bug Depends On: 2540730    
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Description OSIDB Bzimport 2026-09-22 16:27:01 UTC 
pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, run_maintenance() handles exceptions outside the loop that processes rows from part_config, so an exception for one partition set immediately terminates the loop and skips every later set. A role with partman_user access can insert or update a row that reliably fails and assign it a low maintenance_order value so it is processed before legitimate rows. Repeated maintenance ticks then abort before legitimate partition sets are maintained, causing database-wide loss of automated partition maintenance. This issue is fixed in version 5.5.0.