Vulnerability in IBM API Connect
CVE-2026-18535
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 are vulnerable to a Regular Expression Denial of Service (ReDoS) attack and to improper neutralisation of wildcard query operators.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.ibm.com/support/pages/node/7291753 (vendor-advisory, patch)
- www.ibm.com/support/pages/node/7292434 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-18535?
- CVE-2026-18535 is a critical-severity vulnerability in IBM API Connect, classified under Inefficient Regular Expression Complexity. CVSS score: 9.6/10. Published 2026-11-07.
- How severe is CVE-2026-18535?
- Critical severity. CVSS v3 base score is 9.6 out of 10.