CVE-2026-51294 in SQLite
Summary
by MITRE • 07/30/2026
SQLite 3.41 is vulnerable to use after free in the jsonArrayLengthFunc function.
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability in SQLite version 3.41 resides within the jsonArrayLengthFunc function, which represents a critical use-after-free condition that can be exploited to execute arbitrary code or cause denial of service. This flaw occurs when the database engine processes JSON array length calculations, specifically during the handling of malformed or specially crafted JSON input that triggers improper memory management. The vulnerability manifests when the system attempts to access memory that has already been freed, creating potential attack vectors for remote code execution or system compromise.
The technical implementation of this use-after-free flaw stems from inadequate memory deallocation handling within the JSON processing subsystem of SQLite. When jsonArrayLengthFunc processes certain JSON array structures, it fails to properly validate memory references before accessing them, leading to scenarios where freed memory locations are accessed or modified. This condition can be triggered through SQL queries that involve JSON functions such as json_array_length() with maliciously constructed inputs that cause the underlying memory management routines to release resources while still maintaining references to them.
The operational impact of this vulnerability extends across multiple attack surfaces within database environments that utilize SQLite 3.41. Attackers can exploit this flaw by crafting specific SQL queries containing malformed JSON data that will trigger the vulnerable function during query execution. The consequences include potential remote code execution on systems running affected SQLite versions, allowing attackers to execute arbitrary commands with the privileges of the database process. Additionally, the vulnerability can lead to denial of service conditions where database operations fail or crash entirely due to memory corruption.
Security professionals should prioritize immediate patching of all systems running SQLite 3.41 to address this use-after-free vulnerability. The remediation involves upgrading to SQLite version 3.42.0 or later, which includes proper memory management fixes for the jsonArrayLengthFunc function. Organizations should also implement input validation controls and sanitize all JSON data processed by SQLite databases to prevent exploitation attempts. Network segmentation and privilege separation can help limit potential damage from successful exploitation attempts.
This vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in software implementations. The attack pattern corresponds to techniques documented in the ATT&CK framework under T1059 for command and script injection, where attackers leverage database vulnerabilities to execute malicious code. The flaw demonstrates a classic memory safety issue that has been prevalent in database engines and can lead to severe security implications when exploited in real-world scenarios. Organizations should conduct thorough vulnerability assessments of their SQLite implementations to identify potential exposure points and ensure proper patch management protocols are maintained across all database systems.
The broader implications for database security highlight the importance of rigorous memory management practices in database engine development. This vulnerability underscores the need for comprehensive testing of JSON processing functions and proper memory lifecycle management in embedded database solutions. Security teams should monitor for similar patterns in other database engines and ensure that input validation controls are robust enough to prevent exploitation of memory safety issues, particularly in systems handling untrusted data sources through SQL interfaces.