CVE-2026-14680 in PostgreSQL
Summary
by MITRE • 08/13/2026
Type confusion with PostgreSQL "internal" data type arguments allows any user to execute arbitrary code as the operating system user running the database, via calls to functions with that argument type. Type "internal" represents a class of mutually-incompatible data structures not intended for access from SQL. The system intended to prevent such function calls, but this prevention had gaps. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical type confusion flaw in PostgreSQL that enables arbitrary code execution with the privileges of the database operating system user. The issue stems from improper handling of the "internal" data type within function calls, where this type serves as a container for mutually-incompatible internal data structures that should remain inaccessible to SQL-level operations. The fundamental problem lies in the insufficient validation mechanisms that were designed to prevent direct access to these internal types from SQL contexts. When users could manipulate function arguments containing internal data types through crafted SQL statements, the system failed to properly validate the type consistency and safety of these operations.
The technical exploitation occurs because PostgreSQL's type system contains gaps in its security controls for internal data type handling. The "internal" type is specifically intended to represent low-level implementation details that should not be directly accessible or manipulable through standard SQL interfaces, yet a flaw in the validation logic allowed these types to be passed through function calls where they could be misinterpreted by the underlying system. This type confusion vulnerability creates an execution path where malicious input can cause the database engine to treat internal structures as if they were legitimate user data, leading to memory corruption and arbitrary code execution.
The operational impact of this vulnerability is severe as it grants attackers complete control over the database server with the privileges of the operating system user running PostgreSQL. This means that any authenticated user in the database could potentially escalate their privileges to system-level access without requiring additional exploitation techniques or privilege escalation methods. The vulnerability affects multiple major PostgreSQL versions including 18.5, 17.11, 16.15, 15.19, and 14.24, indicating a widespread exposure across the PostgreSQL ecosystem. Organizations running these affected versions face significant risk of data compromise, system takeover, and potential lateral movement within their network infrastructure.
Security mitigations for this vulnerability should focus on immediate patching of all affected PostgreSQL versions to ensure that proper type validation is enforced for internal data types. System administrators must also implement additional monitoring of function calls involving internal types and establish strict access controls for database functions. The fix addresses the root cause by strengthening the validation mechanism that prevents internal type arguments from being passed through SQL-level function calls, aligning with security best practices outlined in CWE-124 for buffer under-reads and CWE-129 for insufficient validation of array indices. This vulnerability also maps to ATT&CK technique T1059.002 for command and scripting interpreter and T1566.001 for spearphishing attachment, as the exploitation would likely occur through database interaction methods targeting the vulnerable PostgreSQL instances.
The vulnerability demonstrates a classic example of insufficient input validation in database systems where type safety mechanisms fail to properly enforce boundaries between different privilege levels. The flaw represents a gap in the principle of least privilege and proper access control enforcement within PostgreSQL's internal function calling mechanism, requiring comprehensive security testing of all data type handling pathways. Organizations should conduct immediate vulnerability assessments of their PostgreSQL deployments and implement network segmentation controls to limit exposure while patches are deployed. This issue highlights the importance of maintaining robust type safety mechanisms in database engines and underscores the need for continuous security validation of internal system interfaces that are not directly exposed to user access.