What is CVE-2025-36009?

CVE-2025-36009 is a medium-severity vulnerability in IBM Db2, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-01-30.

How severe is CVE-2025-36009?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in IBM Db2

CVE-2025-36009

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.

Published 2026-01-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (30.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

IBM Db2
IBM Db2 For Linux, Unix And Windows — versions 11.5.0, 12.1.0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

www.ibm.com/support/pages/node/7257695 (vendor-advisory, patch, Not Applicable)

Frequently asked questions

What is CVE-2025-36009?: CVE-2025-36009 is a medium-severity vulnerability in IBM Db2, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-01-30.
How severe is CVE-2025-36009?: Medium severity. CVSS v3 base score is 6.5 out of 10.