7286998

IBM® Data Server driver for JDBC and SQLJ could allow an evil Db2 server to perform an arbitrary file write on the connected client due to improper validation of file paths. This vulnerability also applies to Db2 due to bundled JDBC and SQLJ components.

Vulnerability Details

CVEID: CVE-2026-15955 DESCRIPTION: IBM DB2 could allow a remote attacker to perform an arbitrary file write due to improper validation of file paths. CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CVSS Source: IBM CVSS Base score: 7.5 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Affected Products and Versions

Affected Product(s) Version(s) Applicable Editions IBM® Db2® 11.5.0 - 11.5.9 Client IBM® Db2® 12.1.0 - 12.1.5 Client Linux and Unix are affected. Windows is not affected.

Linux and Unix are affected. Windows is not affected.

Customers running any vulnerable affected level of an affected Program, V11.5, and V12.1, can download the security update containing the interim fix for this issue from Fix Central. These security updates are available based on the most recent level for each impacted release: V11.5.9, V12.1.4, and V12.1.5. They can be applied to any affected level of the appropriate release to remediate this vulnerability. Release Fixed in mod pack APAR Download URL V11.5 TBD DT475647 Security Update #90467 or later for V11.5.9 available at this link: V12.1 TBD DT475647 Security Update #91310 or later for V12.1.4 available at this link: Security Update #89304 or later for V12.1.5 available at this link: IBM does not disclose key Db2 functionality nor replication steps for a vulnerability to avoid providing too much information to any potential malicious attacker. IBM does not want to enable a malicious attacker with sufficient knowledge to craft an exploit of the vulnerability.

Customers running any vulnerable affected level of an affected Program, V11.5, and V12.1, can download the security update containing the interim fix for this issue from Fix Central. These security updates are available based on the most recent level for each impacted release: V11.5.9, V12.1.4, and V12.1.5. They can be applied to any affected level of the appropriate release to remediate this vulnerability.

Security Update #91310 or later for V12.1.4 available at this link:

Security Update #89304 or later for V12.1.5 available at this link:

IBM does not disclose key Db2 functionality nor replication steps for a vulnerability to avoid providing too much information to any potential malicious attacker. IBM does not want to enable a malicious attacker with sufficient knowledge to craft an exploit of the vulnerability.

Workarounds and Mitigations

Get Notified Future Security Bulletins

Complete CVSS v3 Guide On-line Calculator v3

14 Sep 2026: Updated Summary to Specify Impact on Db2 and Title to Specify Client Side Impact 10 Sep 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Was this topic helpful?

Modified date: 14 September 2026

Initial Publish date: 10 September 2026