Vulnerability · Published Nov 7, 2026 · Assigned by ibm
CVE-2026-18535IBM API Connect Denial of Service
Critical 9.6
In plain English
A critical-severity regular-expression denial of service in API Connect from IBM. There are no confirmed reports of exploitation so far.
Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)–no EPSS score yet
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| IBM | API Connect | 12.1.0.0 – through 12.1.1.210.0.8.0 – through 10.0.8.12 |
Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
References
- https://www.ibm.com/support/pages/node/7291753 vendor-advisory, patch
- https://www.ibm.com/support/pages/node/7292434 vendor-advisory, patch