CVE-2025-36423 IBM Db2 Denial of Service

What is CVE-2025-36423?

CVE-2025-36423 is a medium-severity denial of service vulnerability in Ibm Db2, published on 30 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 12.1.0 - 12.1.3 could allow a local user to cause a denial of service due to improper neutralization of special elements in data query logic.

Weakness: CWE-1284

Which versions are affected by CVE-2025-36423?

It affects 1 product.

Products include Ibm Db2.

How do I fix CVE-2025-36423?

Apply the vendor's patch.

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-2025-36423 being exploited?

There is no known exploitation of CVE-2025-36423 in the wild and no public exploit code.

Other vulnerabilities in Ibm Db2

• CVE-2012-1797 IBM DB2 9.5 uses world-writable permissions for nodes.reg, which has unspecified impact and attack vectors. Critical 10.0
• CVE-2010-3731 Memory corruption in n/a Critical 10.0
• CVE-2010-3193 Other in n/a Critical 10.0
• CVE-2009-4335 Other in n/a Critical 10.0
• CVE-2009-3473 Missing authorization in n/a Critical 10.0

All Ibm Db2 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-f8r7-633c-jqq8, ROOT-OS-UBUNTU-2204-CVE-2025-36423.