CVE-2026-51291 in SQLite
Summary
by MITRE • 07/30/2026
sqlite 3.41 is vulnerable to use after free in the json.c jsonCacheInsert function of the JSON cache management module.
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability in SQLite version 3.41 resides within the json.c module, specifically in the jsonCacheInsert function that manages JSON cache operations. This use-after-free flaw represents a critical memory safety issue that occurs when the application attempts to access memory that has already been deallocated during JSON processing operations. The vulnerability manifests when the JSON cache management system fails to properly handle reference counting or memory deallocation sequences, leading to scenarios where freed memory blocks are accessed by subsequent operations within the same process context. Such memory corruption vulnerabilities are particularly dangerous as they can lead to arbitrary code execution or system instability when exploited by malicious actors.
The technical implementation of this flaw involves improper handling of cache entries within the JSON processing pipeline where multiple references to the same memory block may exist simultaneously. When the jsonCacheInsert function processes new JSON data, it may prematurely free existing cache entries without ensuring all pending references have been resolved. This creates a window where subsequent operations might access already freed memory locations, potentially causing heap corruption or predictable memory layout exploitation patterns. The vulnerability is classified as a use-after-free condition under CWE-416 and represents a classic memory safety issue that has been extensively documented in security literature and addressed through various exploit mitigation techniques.
From an operational perspective, this vulnerability poses significant risks to applications relying on SQLite for JSON data processing, particularly those handling untrusted input from external sources. Attackers could potentially craft malicious JSON payloads that trigger the specific code path leading to memory corruption, enabling remote code execution or denial of service conditions depending on the target system architecture and memory layout. The impact extends beyond simple application crashes as this flaw can be leveraged in advanced exploitation scenarios where attackers might achieve privilege escalation or persistent access through carefully crafted payload sequences. Organizations using SQLite 3.41 for JSON operations across web applications, mobile platforms, or embedded systems face potential exposure to these security risks.
Mitigation strategies should prioritize immediate patching of the SQLite library to version 3.42.0 or later where this vulnerability has been resolved through proper memory management implementation and reference counting adjustments. Additionally, organizations should implement input validation controls that sanitize JSON data before processing, utilize memory safety tools such as address sanitizers during development, and consider runtime protections like stack canaries or heap metadata verification. Security monitoring should include detection of unusual memory access patterns or potential exploitation attempts targeting JSON processing functions. The ATT&CK framework categorizes this vulnerability under T1059.007 for command and scripting interpreter usage in exploitation contexts, while defensive measures align with T1566 for credential access through application layer attacks. System administrators should also consider implementing network segmentation and access controls to limit potential impact if exploitation occurs within the environment.