External risk intelligence

Apache IoTDB Path Traversal Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-40005

Apache IoTDB is a database management system designed for IoT data. While these systems are typically deployed within internal or restricted industrial networks to manage time-series data, they can be configured with public-facing interfaces for data ingestion or remote management in some specific deployment architectures.

Path Traversal

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

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Apache IoTDB could allow an attacker to write arbitrary files to any location where the IoTDB process has write permissions, potentially impacting data integrity and system availability. This issue affects Apache IoTDB versions from 1.0.0 before 2.0.10.

Attackers can overwrite files with no special access.
Critical for securing data management in IoT environments.
Confirm relevance and assess exposure immediately.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted requests to the Apache IoTDB service. If the service is exposed to the network, an unauthenticated attacker could leverage an unsafe API to write arbitrary files to any location the IoTDB process has write access to, potentially leading to system compromise.

Network exposure required.
Unsafe API triggers vulnerability.
Arbitrary file write risk.

Live Threat

Current exploitation, exposure, and threat context

An attacker could write arbitrary files to any location where the Apache IoTDB process has write permissions. This could impact system data and service behavior when the affected API is used.

System configuration files at risk.
Arbitrary file writes to writable locations.
Potential for system instability or compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

The platform or infrastructure team managing Apache IoTDB deployments is likely responsible for addressing this critical vulnerability. The first step involves identifying all instances of the affected technology, confirming their reachability and business criticality, and then determining the accountable owner to plan remediation.

Platform/Infrastructure teams own this.
Verify all IoTDB instances and reachability.
Plan and execute upgrades or vendor engagement.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is Apache IoTDB?

Apache IoTDB is a specialized database management system built to handle high-frequency time-series data. It is widely used in industrial and internet-of-things (IoT) environments to collect, store, and analyze massive amounts of sensor data efficiently, supporting the complex data demands of connected machinery and devices.

What does path traversal mean for CVE-2026-40005?

This vulnerability is classified as improper limitation of a pathname to a restricted directory, or path traversal (CWE-22). In plain terms, it means the software fails to properly sanitize user input, allowing an attacker to navigate outside the intended folder structure. In the context of CVE-2026-40005, this weakness allows an attacker to write files into sensitive system locations that the database service is authorized to access.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by sending specifically crafted requests to the Apache IoTDB service that utilize an unsafe API. The vulnerability specifically involves unauthorized file writing; it is not triggered by standard data ingestion or routine read operations. If the specific API that lacks proper path validation is disabled or not in use, the risk associated with this attack path is mitigated.

Is my Apache IoTDB deployment at risk?

According to Halo Surface Signal, risk depends on how your database is networked. While IoTDB is often found in restricted internal or industrial networks, your risk increases if your instance is configured with public-facing interfaces for remote management or data ingestion. If the service is accessible over the internet, it is reachable by external actors who could attempt to leverage this flaw.

What should I do to address CVE-2026-40005?

Begin by creating an inventory of all your Apache IoTDB instances to determine which are reachable across your network. Once you have identified your assets, prioritize updating any versions between 1.0.0 and 2.0.9 to version 2.0.10, which contains the fix. Coordinate with your infrastructure team to ensure these updates are applied to all identified instances as soon as possible.

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.