CVE-2025-36009 IBM Db2 Denial of Service

What is CVE-2025-36009?

CVE-2025-36009 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) could allow an authenticated user to cause a denial of service due to excessive use of a global variable.

Weakness: CWE-1284

Which versions are affected by CVE-2025-36009?

It affects 1 product.

Products include Ibm Db2.

How do I fix CVE-2025-36009?

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-2025-36009 being exploited?

There is no known exploitation of CVE-2025-36009 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-h944-mx2g-43vq, ROOT-OS-UBUNTU-2204-CVE-2025-36009.