External risk intelligence

SQLite Use-After-Free Leads to Crash and Information Leak

CVE advisorySeverity: UNKNOWN

CVE-2026-51300

SQLite is an embedded library, not a standalone server. Internet reachability depends entirely on whether an application exposes a database interface to untrusted inputs. While the vulnerability allows remote exploitation, it is not inherently exposed by design.

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in SQLite's expression handling could allow remote attackers to crash applications or leak sensitive memory by crafting malicious SQL queries. The main concern is to confirm if any of our applications use affected versions of SQLite and expose database interfaces to untrusted inputs.

Malicious queries can crash apps and leak data.
Affects applications using vulnerable SQLite versions.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this by sending specially crafted SQL queries over a network to an application that uses a vulnerable version of SQLite. This malicious input manipulates how the application handles expression data, leading to the reuse of memory that has already been freed. Such an action can cause the application to crash or leak sensitive information from its memory.

No authentication or special access needed.
Malicious SQL query triggers invalid memory access.
Application crash or sensitive memory leakage.

Live Threat

Current exploitation, exposure, and threat context

A use-after-free vulnerability in SQLite's expression parsing could allow a remote attacker to crash applications or leak sensitive memory. This occurs when malicious SQL queries cause the program to access memory that has already been freed, leading to invalid memory access.

Application crashes.
Malicious SQL query execution.
Sensitive memory information leakage.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in SQLite's expression parsing and memory management may impact applications that embed the SQLite library and expose database interfaces to untrusted inputs. The first practical step is for application owners and platform teams to identify where SQLite is used, assess its reachability and criticality, and then plan remediation.

Application owners should lead remediation.
Verify application exposure to untrusted input.
Plan maintenance for affected applications.

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is SQLite and how is it typically used?

SQLite is a popular, lightweight database engine implemented as a C-language library. Unlike traditional database servers, it is embedded directly into host applications, meaning it operates within the memory and process space of the software that uses it. Developers frequently choose SQLite to store application data locally or to manage structured configuration files because it requires no separate server processes to run.

What does the CWE-416 vulnerability mean for CVE-2026-51300?

CWE-416, known as a use-after-free vulnerability, occurs when a program continues to use a memory address after that memory has been officially released. In this specific SQLite flaw, the system incorrectly maintains a reference to an expression object even after it has been deleted. When the software attempts to access that dangling pointer, it performs invalid memory operations, which can lead to software instability or the unintended disclosure of information stored in that memory.

How can a remote attacker trigger this memory error?

An attacker triggers this bug by providing specially crafted SQL queries to an application that processes user-supplied input through a vulnerable version of SQLite. The attack does not require authentication or specific system privileges. Notably, the vulnerability only occurs when the application successfully processes the malicious query structure; simply having the SQLite library present in the software environment without an active, reachable interface does not trigger the bug.

How do I know if my application is at risk?

According to Halo Surface Signal, risk is not determined by the presence of SQLite alone, but by how it is used. You should care if your software exposes an interface that accepts and processes untrusted SQL input from external sources. Because SQLite is an embedded component, the vulnerability is only reachable if your application architecture effectively bridges the gap between public network traffic and the internal database processing logic.

What should I do first to address this CVE?

Your priority is to conduct an inventory to identify all software components that incorporate SQLite. Once you have a list, verify which applications specifically allow external, untrusted input to interact with the database parsing engine. You do not need to take immediate action on every instance of SQLite, but you should prioritize applications that are internet-facing and actively process user-provided queries while you plan for future maintenance updates.

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.