Bug 2572552 (CVE-2026-120154)

Summary: CVE-2026-120154 postgresql: PostgreSQL: Row-level security bypass via INSERT ON CONFLICT DO UPDATE
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. An authenticated database user with table modification privileges can bypass Row-Level Security (RLS) policies, leading to unauthorized information disclosure. By executing iterated INSERT ... ON CONFLICT DO UPDATE statements, an attacker can read protected rows that should otherwise be restricted by security policies.
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Description OSIDB Bzimport 2026-11-12 14:32:56 UTC 
Improper protection in PostgreSQL INSERT ... ON CONFLICT allows an attacker having INSERT, UPDATE, and applicable SELECT privileges on the table to read every row despite row security policies, via iterated INSERT ... ON CONFLICT DO UPDATE.  Unlike CVE-2026-16237, this does not facilitate improper writes.  Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.