CVE-2023-26021: IBM Db2 denial of service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-28 · updated 2026-06-17
Weakness: CWE-20

Description

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 is vulnerable to a denial of service as the server may crash when compiling a specially crafted SQL query using a LIMIT clause. IBM X-Force ID: 247864.

Affected products

IBM Db2 for Linux, UNIX and Windows: from 11.1 before 11.1.4; from 11.5 before 11.5.8; 11.1.4, 11.1.4-fp1, 11.1.4-fp2, 11.1.4-fp3, 11.1.4-fp4, 11.1.4-fp5 (+1) — fixed in 11.1.4, 11.5.8

How to fix

Upgrade to a fixed version: IBM Db2 for Linux, UNIX and Windows 11.1.4, 11.5.8. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/247864
https://security.netapp.com/advisory/ntap-20230511-0010/
https://www.ibm.com/support/pages/node/6985681
https://exchange.xforce.ibmcloud.com/vulnerabilities/247864
https://security.netapp.com/advisory/ntap-20230511-0010/
https://www.ibm.com/support/pages/node/6985681

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