External risk intelligence

IBM Db2 DRDA Remote Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-10109

IBM Db2 is a database management system typically deployed within internal network segments, protected by firewalls and application-layer access controls. While the DRDA protocol is network-reachable, direct exposure of database ports to the public internet is a highly uncommon and insecure configuration pattern.

Code Injection

Ibm Db2

11.5.0 to 11.5.912.1.0 to 12.1.4

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

IBM Db2 database software has a critical vulnerability allowing remote code execution without authentication. This could potentially compromise sensitive information and disrupt operations if exploited. The main concern is confirming relevance and exposure within our environment.

Remote code execution vulnerability in IBM Db2.
Critical flaw could impact data and operations.
Assess exposure; confirm relevance and impact.

Attack Path

How an attacker could exploit the issue

Attackers can remotely execute code on IBM Db2 systems by exploiting an improper handling of the DRDA handshake before authentication. This vulnerability requires no prior access or user interaction, allowing a threat actor to gain control of the database.

No authentication required.
Vulnerable DRDA handshake handling.
Remote code execution possible.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated remote attacker to execute arbitrary code on systems running affected versions of IBM Db2 when the DRDA protocol is exposed. This could lead to a compromise of the database server's integrity and confidentiality.

Database server's remote code execution capability.
Improper DRDA handshake handling.
Unauthenticated remote code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in IBM Db2's DRDA handshake handling necessitates action from database administrators and potentially platform or infrastructure teams responsible for managing database servers. The immediate priority is to identify all instances of the affected Db2 versions within the environment, assess their exposure and criticality, and confirm the accountable system owners before planning remediation, which may involve vendor coordination or applying specific configuration changes.

Database administrators should own the issue.
Verify DRDA handshake exposure and critical systems.
Plan remediation based on risk and vendor guidance.

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.

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Frequently asked questions

What is IBM Db2 and what is it used for?

IBM Db2 is a relational database management system that organizations use to store, analyze, and manage structured data for enterprise applications. It supports complex transactions and large-scale data processing across various business operations, serving as a foundational component that holds sensitive records and powers internal systems.

What does CWE-94 mean in the context of CVE-2026-10109?

CWE-94 refers to improper control of generation of code, which essentially means the software is vulnerable to code injection. In this specific case, the flaw allows an attacker to send specially crafted data to the database, which the system then inadvertently treats as executable instructions. This gives the attacker the ability to run arbitrary commands on the server without needing a valid login.

How does an attacker trigger this vulnerability?

The vulnerability is triggered during the Distributed Relational Database Architecture (DRDA) handshake process, which occurs before authentication is even requested. An attacker initiates this by sending malicious network packets to the service. It is important to note that regular, legitimate database queries or standard application traffic that completes the handshake correctly do not trigger this vulnerability.

Is my IBM Db2 server at risk?

According to Halo Surface Signal, this vulnerability is most relevant if your database port is directly accessible from the public internet, which is an insecure configuration. Because IBM Db2 is typically deployed within internal network segments and protected by firewalls, the likelihood of remote exploitation is considered low for most standard, well-configured enterprise environments.

What should I do first to address this CVE?

Your priority is to identify all instances of the affected IBM Db2 versions within your network. Work with your infrastructure team to verify if these database instances are exposed to external networks. Once you have an inventory of your systems and their network placement, coordinate with your database administrators to review vendor guidance and prepare for necessary updates or configuration changes to secure the DRDA communication path.

References

www.ibm.com/support/pages/node/7277424

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.