External risk intelligence

HiRDB Stack-Based Buffer Overflow Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-82118

HiRDB is a relational database management system. Databases are typically deployed within internal network segments or behind firewalls to restrict access to authorized application servers. While network-accessible, direct exposure of a database port to the public internet is not a common or standard deployment practice.

Buffer Overflow

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in HiRDB, a database management system. This issue allows for unauthenticated remote attackers to potentially compromise the integrity and availability of data. While the technical details are complex, the high-level concern is the potential for unauthorized access and disruption to database operations.

A database vulnerability could impact data integrity.
It is important to verify if this database system is in use.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted network requests to the vulnerable HiRDB component. If successful, this could allow an attacker to remotely execute code on the affected system, potentially leading to a complete compromise.

No privileges required for access.
Specially crafted network requests trigger vulnerability.
Remote code execution, data theft, or system control.

Live Threat

Current exploitation, exposure, and threat context

A stack-based buffer overflow in HiRDB could allow an unauthenticated attacker to crash the service or potentially execute arbitrary code. This could affect the availability and integrity of data stored within the HiRDB database.

Database service availability.
Unauthenticated network access.
Denial of service or code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in HiRDB affects database servers and is likely managed by the database administration or platform teams. The first practical step is to identify all HiRDB instances, assess their exposure and business criticality, and determine the accountable owner for each. Remediation planning should then be prioritized based on this risk assessment.

Database or platform teams own this issue.
Verify HiRDB instance exposure and criticality.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

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.

Free EASM Trial See How Signal Works

Frequently asked questions

What is HiRDB?

HiRDB is a relational database management system designed for high-performance data processing and enterprise-level storage. It is used by organizations to manage large volumes of structured information, serving as the backend data repository for various business-critical applications.

What does the stack-based buffer overflow in CVE-2026-82118 mean?

This vulnerability is classified as CWE-121, which occurs when a program writes more data to a memory buffer located on the stack than it is designed to hold. In the context of CVE-2026-82118, this memory error can allow an attacker to overwrite adjacent memory, potentially causing the database service to crash or enabling the execution of unauthorized commands.

How is this vulnerability triggered?

The vulnerability is triggered when an attacker sends specially crafted network requests directly to the vulnerable HiRDB component. It is important to note that sending legitimate, standard database queries or routine traffic does not trigger this flaw; the issue specifically requires malicious input designed to exploit the memory overflow.

Is my HiRDB instance at risk?

According to Halo Surface Signal, HiRDB is typically deployed within internal network segments or shielded by firewalls, making direct public internet exposure uncommon. Your risk depends on whether your database ports are inadvertently accessible from outside your secure network boundaries.

How should I respond to CVE-2026-82118?

Your first step is to conduct an inventory to identify all active HiRDB instances within your environment. Once identified, confirm the specific version you are running and evaluate the network placement of these servers. Prioritize remediation planning by identifying the responsible system owners and assessing the business criticality of the data hosted on those specific instances.

References

www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2…

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.