CVE-2026-9338: IBM WebSphere Application Server

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to a denial of service, caused by sending a specially-crafted request. A remote attacker could exploit this vulnerability to trigger excessive resource consumption, potentially leading to reduced availability of the affected service.

Affected products

• IBM WebSphere Application Server: from 8.5.0.0, before 8.5.5.31 (fixed in 8.5.5.31); from 9.0.0.0, before 9.0.5.29 (fixed in 9.0.5.29)

Published 2026-09-10. Last modified 2026-09-16.