Bug 2572574 (CVE-2026-16237)

Summary: CVE-2026-16237 postgresql: postgresql: Security restriction bypass via INSERT ON CONFLICT on auto-updatable views
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in PostgreSQL. When handling conflict-resolving insert statements (INSERT ... ON CONFLICT) on auto-updatable views, the database fails to properly enforce view boundary restrictions. An authenticated attacker with insert and update privileges on a view can exploit this vulnerability through repeated queries to bypass filtering conditions, allowing them to read and modify unauthorized rows in the underlying base table.
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Description OSIDB Bzimport 2026-11-12 14:34:19 UTC 
Improper protection in PostgreSQL INSERT ... ON CONFLICT on auto-updatable views allows an attacker having INSERT and UPDATE privileges on the view to read and modify every row in the view's base table, via iterated INSERT ... ON CONFLICT DO UPDATE.  This bypasses the view's WHERE condition, whether or not the view is a security_barrier view.  Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.