Bug 2538137 (CVE-2026-61818)

Summary: CVE-2026-61818 pg_partman: SQL injection in undo partition time encoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: urgent    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in pg_partman. The undo_partition function improperly handles input from part_config.time_encoder, allowing it to be interpreted as executable SQL code. A user with partman_user access can inject malicious SQL, which then executes with the privileges of the user invoking undo_partition(). This vulnerability can lead to a complete compromise of confidentiality, integrity and availability of the affected database.
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Bug Depends On: 2540724    
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Description OSIDB Bzimport 2026-09-22 17:15:00 UTC 
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.