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CVE-2026-17079 is a security bypass vulnerability affecting IBM Db2 Mirror for i versions 7.4, 7.5, and 7.6. The flaw resides in the server-side input validation mechanism, which can be intentionally disabled by a remote authenticated attacker through a crafted request parameter. By manipulating this parameter, an attacker can effectively turn off the validation checks that are normally performed on the server, allowing malicious or malformed data to be processed by the application.
The core issue is that the application trusts a client-supplied value to determine whether server-side validation should be enforced. In a secure design, such validation logic should be controlled exclusively on the server side and should never be delegable to the client. However, in this case, the presence of a specific request parameter—likely a boolean flag or a mode switch—can override this behavior. An authenticated attacker with knowledge of the parameter can inject it into their requests, bypassing critical security checks that would otherwise block unauthorized actions or data manipulation.
This vulnerability is particularly concerning because it does not require complex exploitation techniques. The attacker only needs to be authenticated to the system and able to craft HTTP requests to the Db2 Mirror for i interface. Once the validation is disabled, the attacker may be able to perform actions that would normally be prohibited, such as accessing restricted data, executing unintended database operations, or even escalating privileges within the application context. The flaw essentially undermines the trust model of the application, as the server fails to maintain control over its own security enforcement logic.
The vulnerability was published by IBM on August 14, 2026, and affects all supported releases of Db2 Mirror for i. Given the medium severity rating (CVSS 6.3), the risk is moderate but should not be underestimated, especially in environments where sensitive data is managed. Exploitation could lead to data manipulation, unauthorized access, and potential compliance violations. Administrators are strongly advised to apply the relevant patches as soon as possible to mitigate the risk.
DailyCVE Form:
Platform: IBM i
Version: 7.4, 7.5, 7.6
Vulnerability: Security Bypass
Severity: Medium (6.3)
Date: August 14, 2026
Prediction: Patch released July 2026
What Undercode Say:
To check your current Db2 Mirror for i version and PTF level, use the following IBM i command:
DSPPTF LICPGM(5770DBM)
To verify if the system is vulnerable, review the PTF level against the fixed versions:
– IBM i 7.4: PTF SJ10109
– IBM i 7.5: PTF S100110
– IBM i 7.6: PTF SJ10111
To check the status of Db2 Mirror services and identify any suspicious activity, administrators can use:
WRKACTJOB SBS(QHTTPSVR)
For detailed logging of authentication and validation events, enable auditing with:
CHGSECAUD QAUDLVL(LOGIN FAIL)
Exploit: (Educational Purposes!)
An attacker could intercept an authenticated session to the Db2 Mirror for i GUI and modify requests to include a parameter that disables server-side validation. For example, if the application expects a parameter like validate=true, the attacker would change it to `validate=false` or remove it entirely. A sample crafted HTTP request might look like:
POST /db2mirror/api/operation HTTP/1.1 Host: target-ibmi.example.com Cookie: sessionid=xyz123 Content-Type: application/x-www-form-urlencoded operation=update&data=malicious&validate=false
If the server does not properly enforce validation on its side, the `validate=false` parameter would be accepted, and the malicious data would be processed without the usual checks. This could allow the attacker to perform unauthorized database updates, read sensitive records, or trigger unintended application behaviors.
Protection:
To protect against CVE-2026-17079, administrators must apply the IBM-supplied PTF fixes for their respective IBM i releases:
– For IBM i 7.4: Install PTF SJ10109
– For IBM i 7.5: Install PTF S100110
– For IBM i 7.6: Install PTF SJ10111
These PTFs are included in the latest cumulative packages: C6183780 (7.4), C6197750 (7.5), and C6190760 (7.6). IBM recommends upgrading the Db2 Mirror for i GUI to Angular 21.0.8, which also addresses related Angular vulnerabilities. Additionally, administrators should review and restrict network access to the Db2 Mirror for i interface, enforce strict authentication policies, and monitor logs for any unusual request patterns that might indicate an attempt to disable validation.
Impact:
Successful exploitation of CVE-2026-17079 allows a remote authenticated attacker to bypass security restrictions. This can lead to unauthorized data access, data manipulation, and potential privilege escalation within the Db2 Mirror for i environment. The integrity and confidentiality of the database could be compromised, and in worst-case scenarios, the attacker may gain sufficient control to disrupt the high-availability mirroring functionality that Db2 Mirror for i provides. Organizations using affected versions should treat this vulnerability with priority and apply the available patches immediately to prevent any exploitation attempts.
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Sources:
Reported By: nvd.nist.gov
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