External risk intelligence

Hypequery SQL Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-54658

Hypequery is a semantic layer library integrated into applications to interface with databases. While it can be part of an internet-facing web application's data path, it is a developer-focused utility/library rather than an edge gateway, VPN, or public-facing service by design. Reachability depends entirely on how the library is implemented within a specific application's architecture.

SQL Injection

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

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in Hypequery, a TypeScript semantic layer for ClickHouse. The issue, found in versions prior to 2.0.2, could allow attackers to inject malicious SQL commands by exploiting how the software handles specific query parameters. This type of vulnerability can have significant data integrity and confidentiality implications.

SQL injection flaw in data layer.
Affects how applications interact with ClickHouse.
Confirm relevance and exposure to specific applications.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted query parameters to an application that uses the affected component. If the component fails to properly escape backslashes before single quotes in these parameters, an attacker could inject malicious SQL commands. This could lead to unauthorized access, modification, or deletion of data within the database.

No authentication or user interaction needed.
Vulnerable `escapeValue()` function.
Arbitrary SQL injection risk.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, specially crafted query parameters with a trailing backslash could allow an attacker to inject arbitrary SQL into ClickHouse instances through the Hypequery TypeScript semantic layer. This could impact the integrity and confidentiality of the data processed by ClickHouse.

Arbitrary SQL injection into ClickHouse.
Exploiting query parameter substitution flaws.
Compromise of data integrity and confidentiality.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-world remediation efforts for this SQL injection vulnerability in Hypequery likely involve application owners and platform teams responsible for managing the TypeScript semantic layer and its ClickHouse integration. The first practical step is to identify all instances where Hypequery is used, determine their exposure and business criticality, and then confirm the accountable team or individual. Once identified, a remediation plan can be formulated, which may include coordinated updates during planned maintenance windows, especially given the critical nature of the vulnerability.

Application and platform teams own remediation.
Verify Hypequery deployment reachability.
Plan updates based on business risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is Hypequery?

Hypequery is a TypeScript-based semantic layer designed to bridge applications with ClickHouse databases. It functions as a development library that helps translate application requests into database queries, simplifying data interaction for developers. Because it is integrated directly into the application's data path, it is not a standalone server but a component used within the custom software you build.

What does CVE-2026-54658 mean for my data?

This CVE describes a SQL injection vulnerability categorized as CWE-89. In simple terms, the library fails to properly clean specific input characters, specifically backslashes near single quotes. This weakness allows an attacker to break out of the intended query structure, potentially tricking the database into executing unauthorized commands that could expose, change, or delete your information.

How does an attacker trigger this vulnerability?

An attacker triggers the bug by sending a crafted query parameter that ends with a backslash. This specific character sequence confuses the escape logic in the software, allowing the attacker to bypass safety checks. Note that simply interacting with the application does not trigger the flaw; the attack requires the application to pass these specifically manipulated parameters through the vulnerable library to the database.

Do I need to worry about my Hypequery implementation?

Relevance depends on your architecture. Halo Surface Signal notes that while Hypequery is a library rather than a public-facing service, your risk increases if your application takes direct input from users and passes it to this library. If your implementation uses Hypequery to process untrusted or internet-facing data, your database could be reachable for this injection, making the component a critical priority.

What is the first step to address this issue?

Your first step is to locate every instance of Hypequery within your codebase to identify where it is deployed. Verify if your application uses a version prior to 2.0.2, as this is the version where the fix was introduced. Once you have an inventory of affected applications, coordinate with your development teams to update the dependency to version 2.0.2 or later during your next maintenance window.

References

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.