CVE-2025-36366: IBM Db2 Denial of Service
Published Jan 29, 2026
·Updated
IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) could allow a user to cause a denial of service by executing a query that invokes the JSONObject scalar function, which may trigger an unhandled exception leading to abnormal server termination.
Affected Software
9 affected components
IBM Db2 for Linux, UNIX and Windows>=11.5.0<=11.5.9, >=12.1.0<=12.1.3
IBM IBM® Db2®<=11.5.0 - 11.5.9
IBM IBM® Db2®<=12.1.0 - 12.1.3
IBM Db2 Linux>=11.5.0<=11.5.9
IBM Db2 Unix>=11.5.0<=11.5.9
IBM Db2 Windows>=11.5.0<=11.5.9
IBM Db2 Linux>=12.1.0<=12.1.3
IBM Db2 Unix>=12.1.0<=12.1.3
IBM Db2 Windows>=12.1.0<=12.1.3
Remediation
Information
Customers running any vulnerable modpack level of an affected Program, V11.5, and V12.1, can download the special build containing the interim fix for this issue from Fix Central. These special builds are available based on the most recent level for each impacted release: V11.5.9, V12.1.2 and V12.1.3. They can be applied to any affected level of the appropriate release to remediate this vulnerability.
ReleaseFixed in mod packAPARDownload URLV11.5TBD https://www.ibm.com/support/pages/node/7087189
V12.1TBD https://www.ibm.com/support/pages/db2-v1212-published-cumulative-special-build-downloads
Special Build #71609 or later for V12.1.3 available at this link:
https://www.ibm.com/support/pages/db2-v1213-published-cumulative-special-build-downloads
Patch Available
Event History
Jan 30, 2026
CVE Published
via MITRE·09:27 PM
Data Sourced
via MITRE·09:27 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Feb 17, 2026
Data Sourced
via IBM·09:54 PM
DescriptionAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-36366?
CVE-2025-36366 is classified as a denial of service vulnerability.
2
How do I fix CVE-2025-36366?
To mitigate CVE-2025-36366, update IBM Db2 to a version beyond 11.5.9 or 12.1.3.
3
Who is affected by CVE-2025-36366?
CVE-2025-36366 affects users of IBM Db2 for Linux, UNIX and Windows versions 11.5.0 to 11.5.9 and 12.1.0 to 12.1.3.
4
What kind of attack is possible due to CVE-2025-36366?
CVE-2025-36366 allows local users to cause a denial of service through improper handling of query logic.
5
What are the products involved in CVE-2025-36366?
CVE-2025-36366 involves IBM Db2 for Linux, UNIX, and Windows, including Db2 Connect Server.