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CVE-2026-17179 is a command injection vulnerability affecting IBM Db2 Mirror for i versions 7.4, 7.5, and 7.6. The flaw allows a remote authenticated attacker to cause a denial of service by injecting arbitrary commands into the system. The vulnerability stems from improper neutralization of special elements used in OS commands, where user-supplied input is passed unsafely to the underlying shell.
IBM Db2 Mirror for i is a high-availability solution that synchronizes two IBM i systems, with its graphical user interface (GUI) running with elevated system privileges to manage the replication. The GUI accepts various requests from authenticated users to control mirroring operations. Due to insufficient input validation and sanitization, an attacker with valid credentials can inject malicious CL (Control Language) commands into specific request parameters.
The injection occurs when the application constructs a system command string using attacker-controllable input without proper escaping or filtering of shell metacharacters. Characters such as semicolons (;), pipes (|), ampersands (&), and backticks (`) are not neutralized, allowing an attacker to terminate the intended command and append their own payload. When the vulnerable endpoint processes the request, the concatenated string is passed to the OS command interpreter, executing the attacker’s injected commands with the privileges of the Db2 Mirror service.
Because the service runs with high system privileges, successful command injection can disrupt the mirroring process, leading to a denial-of-service condition. The attacker could pause data synchronization, terminate critical processes, or exhaust system resources, effectively breaking the high-availability setup. In environments where Db2 Mirror is central to banking, retail, or logistics operations, such disruption can have severe operational consequences.
The CVSS vector for this vulnerability reflects moderate severity, as it requires authentication but is network-exploitable with low attack complexity. IBM has acknowledged the issue and released PTF (Program Temporary Fix) patches to address the flaw. Administrators are strongly advised to apply these updates immediately to prevent potential exploitation.
DailyCVE Form:
Platform: IBM Db2 Mirror
Version: 7.4, 7.5, 7.6
Vulnerability: Command Injection
Severity: Medium
date: August 14, 2026
Prediction: August 21, 2026
What Undercode Say:
Check if Db2 Mirror GUI is exposed netstat -an | grep 8080 Verify installed PTF level on IBM i DSPPTF Search for suspicious CL commands in system logs DSPJRN JRN(QSYS/QAUDJRN) JRNCDE((T ALL)) OUTPUT(PRINT)
Exploit: (Educational Purposes!)
Crafted POST request injecting a CL command to terminate mirroring curl -X POST https://target:8080/db2mirror/endpoint \ -H "Authorization: Basic <base64-creds>" \ -d "param=valid_value; ENDMIRROR ALL" Injection to cause denial of service by consuming system resources curl -X POST https://target:8080/db2mirror/endpoint \ -d "input=test; DOFOR i=1 TO 999999; ENDDO" Attempt to stop the Db2 Mirror service curl -X POST https://target:8080/db2mirror/endpoint \ -d "action=start; ENDTCPSVR ALL"
Protection:
Apply IBM PTFs immediately: SJ10947 for v7.4, SJ10961 for v7.5, or SJ10948 for v7.6. Restrict network access to the Db2 Mirror GUI so it is not exposed to untrusted networks. Implement strict input validation and parameterized command execution to neutralize special characters. Monitor system logs for unexpected command executions originating from Db2 Mirror service accounts.
Impact:
Successful exploitation allows an authenticated remote attacker to execute arbitrary system commands, leading to denial of service by disrupting database mirroring and high-availability failover capabilities. The attack can pause data synchronization, terminate critical processes, or exhaust system resources. In environments relying on Db2 Mirror for business continuity, this can result in significant operational downtime and potential data loss during failover events.
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Sources:
Reported By: nvd.nist.gov
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