CVE-2026-4410 IBM CVE debrief

Who should care

Organizations running IBM WebSphere Application Server Liberty versions 19.0.0.7 through 26.0.0.5, or WebSphere Application Server 9.0/8.5, particularly those with exposed management interfaces or limited network segmentation. Infrastructure teams responsible for Java application server security and availability should prioritize patching.

Technical summary

The vulnerability stems from improper handling of specially crafted requests leading to uncontrolled memory consumption (CWE-400). Affected components include IBM WebSphere Application Server Liberty (19.0.0.7-26.0.0.5), WebSphere Application Server 9.0, and 8.5. The attack requires adjacent network access and low privileges but high attack complexity, resulting in high availability impact through memory resource exhaustion. No confidentiality or integrity impacts are associated with this vulnerability.

Defensive priority

medium

Recommended defensive actions

• Apply IBM-provided security updates for affected WebSphere Application Server versions per vendor guidance
• Review network segmentation to limit adjacent network access to WebSphere management interfaces
• Monitor server memory utilization for anomalous consumption patterns
• Validate that WebSphere deployments run supported versions (Liberty 26.0.0.6 or later, or vendor-specified fixes)
• Assess exposure of WebSphere administrative interfaces and restrict access to authorized hosts only

Evidence notes

The vulnerability affects multiple IBM WebSphere Application Server versions including Liberty 19.0.0.7-26.0.0.5, WAS 9.0, and WAS 8.5. The attack vector requires adjacent network access with high complexity, limiting widespread exploitation. No evidence of known ransomware campaign use or CISA KEV inclusion as of the source publication date.

Official resources