CVE-2026-51293 in SQLite
Summary
by MITRE • 07/30/2026
A use-after-free vulnerability exists in SQLite 3.41 when the jsonBlobAppendNode() function is invoked subsequent to sqlite3DbFree() being called on the aBlob member of the Parse structure.
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical use-after-free condition within the SQLite database engine version 3.41 that arises from improper memory management during JSON blob processing operations. The flaw occurs specifically when the jsonBlobAppendNode() function attempts to operate on a memory region that has already been freed through a preceding call to sqlite3DbFree() on the aBlob member of the Parse structure. This memory corruption scenario creates a potential attack vector where maliciously crafted JSON data could trigger unauthorized memory access patterns.
The technical implementation of this vulnerability stems from the failure to properly track memory references within the SQLite parsing context. When the Parse structure's aBlob member is freed by sqlite3DbFree(), subsequent calls to jsonBlobAppendNode() still attempt to reference this now-invalidated memory location. This fundamental flaw violates standard memory safety principles and creates opportunities for arbitrary code execution or denial of service conditions. The vulnerability operates at the intersection of memory management and JSON processing within SQLite's internal parsing mechanisms, making it particularly dangerous as it can be triggered through legitimate database operations involving JSON data.
From an operational impact perspective, this vulnerability presents significant risks to systems relying on SQLite for data storage and processing. Attackers could potentially exploit this condition by constructing malicious JSON content that when processed through SQLite's parsing functions would cause the freed memory to be accessed again, leading to unpredictable behavior including application crashes, memory corruption, or in severe cases, remote code execution. The vulnerability affects any system using SQLite 3.41 where JSON processing is enabled, making it a widespread concern across numerous applications and platforms that depend on this database engine.
The mitigation strategies for this vulnerability should focus on immediate patching of SQLite to version 3.42 or later where the memory management issue has been addressed through proper reference tracking and validation. Organizations should also implement input validation measures to restrict JSON data processing when possible, and consider runtime monitoring solutions to detect anomalous memory access patterns. This vulnerability aligns with CWE-416 which specifically addresses use-after-free conditions in software systems. From an ATT&CK framework perspective, this represents a potential privilege escalation vector through memory corruption techniques and could be categorized under initial access and execution phases of adversary behavior. System administrators should also conduct thorough testing of patched environments to ensure that the fix does not introduce regressions in existing JSON processing functionality while maintaining the security posture against this specific memory safety issue.