CVE-2023-26021 IBM Db2 denial of service

High 7.5 Published 28 Apr 2023 Updated 13 Feb 2025

Attackers can crash the IBM Db2 server by submitting a specially crafted SQL query with a LIMIT clause, causing a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-26021?

CVE-2023-26021 is a high-severity denial of service vulnerability in Ibm Db2, published on 28 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2023-26021?

It affects 1 product.

Products include Ibm Db2.

How do I fix CVE-2023-26021?

No fix has been published for CVE-2023-26021 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-26021 being exploited?

There is no known exploitation of CVE-2023-26021 in the wild and no public exploit code.

All Ibm Db2 vulnerabilities

Sources

Also known as GHSA-4433-37fm-3jq5.