IBM Db2 Remote Code Execution via JDBC URL Vulnerability (CVE-2026-9762)

IBM Db2 versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.4 are affected by a high-severity remote code execution (RCE) vulnerability, CVE-2026-9762. This flaw allows an attacker to execute arbitrary code on the underlying system if they can manipulate an application's JDBC URL connection string. The vulnerability is classified as an improper control of generation of code (CWE-94), commonly known as code injection. This means that if an application constructs JDBC URLs using unvalidated user input, an attacker can inject malicious code that the Db2 instance will then execute. This vulnerability poses a significant risk to organizations running affected Db2 instances, as successful exploitation grants the attacker full control over the database server, leading to potential data compromise, system disruption, or further network penetration.

Attack Chain

1. Vulnerable Application Interaction: An attacker identifies an application or service that utilizes IBM Db2 and incorporates user-supplied input into its JDBC URL connection strings.
2. Malicious Input Crafting: The attacker crafts a specialized input string containing malicious commands or code designed to be embedded within the JDBC URL.
3. Controlled JDBC URL Submission: The malicious input is provided to the vulnerable application, which then constructs and sends the specially crafted JDBC URL to the target IBM Db2 instance.
4. Code Injection (CWE-94): During the process of establishing a connection or parsing the malformed JDBC URL, the vulnerable IBM Db2 instance fails to adequately sanitize or validate the attacker's input, leading to a code injection event (CWE-94).
5. Remote Code Execution: The injected malicious code or commands are executed by the Db2 process on the host operating system, granting the attacker remote code execution capabilities.
6. System Compromise: With RCE, the attacker gains unauthorized control over the server hosting the IBM Db2 instance, allowing for subsequent actions such as data exfiltration, deployment of additional malware, or lateral movement within the network.

Impact

A successful exploitation of CVE-2026-9762 leads to full remote code execution on the server hosting the vulnerable IBM Db2 instance. This grants attackers complete control over the compromised system, allowing for unauthorized data access, modification, or deletion within the database and potentially other system files. Organizations could face severe data breaches, system downtime, integrity loss, and compliance failures. The specific number of victims and targeted sectors are not detailed in the NVD entry, but any organization using affected IBM Db2 versions in scenarios where JDBC URLs are influenced by user input is at risk.

Recommendation

• Immediately patch IBM Db2 to a fixed version or apply official vendor security updates to address CVE-2026-9762.
• Implement robust input validation and sanitization procedures in all applications that construct JDBC URLs based on user-supplied data to prevent code injection.
• Monitor Db2 instances and their host systems for unusual process creation originating from the Db2 process.
• Enable comprehensive logging for process creation and network connections on Db2 servers to identify anomalous activity, which could indicate post-exploitation behavior.