Bug 2572544 (CVE-2026-116303)

Summary: CVE-2026-116303 postgresql: PostgreSQL: Unauthorized execution of restricted cast functions via type conversion operations
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: low    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in PostgreSQL. An authenticated database user can bypass permission checks to invoke restricted type conversion (cast) functions without the necessary execution privileges. By triggering operations such as foreign key evaluations or data formatting functions, a user may execute unauthorized functions and potentially access sensitive information.
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Description OSIDB Bzimport 2026-11-12 14:32:25 UTC 
Missing authorization in PostgreSQL type conversion allows a database user to invoke a cast function despite lacking EXECUTE privilege on that function, via foreign keys, to_json(), and others.  A successful attack requires the attacker to search each database for access-restricted cast functions and identify confidentiality impact specific to each function implementation found.  There are few or no practical examples of an access-restricted cast function or of a cast function having confidentiality impact.  Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.