CVE-2025-36122: IBM® Db2® is vulnerable to a denial of service with a specially crafted query when stmtheap is set to automatic

Published Apr 30, 2026
·
Updated

IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.3 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow an authenticated user to cause a denial of service using a specially crafted SQL query due to improper allocation of system resources.

Affected Software

10 affected components
IBM DB2>=11.5.0<=11.5.9, >=12.1.0<=12.1.3
IBM Db2 Connect Server>=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 affected 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. 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 V12.1.4 https://www.ibm.com/support/pages/node/7267513 Note: To apply this fix, it is required to set DB2_STRICT_INSTANCE_MEMORY=ON in addition to installing the above Special Build. 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.

Event History

Apr 30, 2026
CVE Published
via MITRE·09:48 PM
Data Sourced
via MITRE·09:48 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via IBM·10:03 PM
DescriptionAffected Software
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2025-36122?

CVE-2025-36122 is a denial of service vulnerability that can severely disrupt the availability of IBM Db2 services.

2

How do I fix CVE-2025-36122?

To mitigate CVE-2025-36122, ensure that the configuration settings for stmtheap are appropriately set and consider upgrading to a patched version of IBM Db2.

3

Who is affected by CVE-2025-36122?

CVE-2025-36122 affects authenticated users of IBM Db2 versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.3 on Linux, UNIX, and Windows platforms.

4

Can CVE-2025-36122 be exploited remotely?

CVE-2025-36122 requires an authenticated user to exploit the vulnerability, which typically limits the attack surface.

5

What versions of IBM Db2 are vulnerable to CVE-2025-36122?

The vulnerable versions of IBM Db2 regarding CVE-2025-36122 are 11.5.0 through 11.5.9 and 12.1.0 through 12.1.3.

Company

Resources

Contact

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