CVE-2025-36009: IBM Db2 Denial of Service

Published Jan 29, 2026
·
Updated

IBM Db2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow an authenticated user to cause a denial of service due to excessive use of a global variable.

Other sources

IBM Db2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow an unauthenticated user to cause a denial of service due to excessive use of a global variable.

— IBM

Affected Software

9 affected components
IBM Db2 for Linux, UNIX and Windows
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 V12.1   TBD   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

Event History

Jan 29, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Jan 30, 2026
CVE Published
via MITRE·09:28 PM
Data Sourced
via MITRE·09:28 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2025-36009?

CVE-2025-36009 has been classified as a denial of service vulnerability.

2

How do I fix CVE-2025-36009?

To mitigate CVE-2025-36009, it is recommended to update IBM Db2 to the latest version that addresses this vulnerability.

3

What versions of IBM Db2 are affected by CVE-2025-36009?

CVE-2025-36009 affects IBM Db2 for Linux, UNIX, and Windows versions 11.5.0 to 11.5.9 and 12.1.0 to 12.1.3.

4

Can CVE-2025-36009 be exploited by an authenticated user?

CVE-2025-36009 can be exploited by an unauthenticated user, making it a significant threat.

5

What are the potential impacts of CVE-2025-36009?

The potential impact of CVE-2025-36009 includes a denial of service, which can disrupt service availability.

Company

Resources

Contact

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